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the following excerpt from DB2 9 Fundamentals: Certification gawk at book, written by means of Roger E. Sanders, is reprinted with permission from MC Press. read the complete Chapter 1, A e bespeak to the IBM DB2 9 certification examination in case you believe taking a DB2 9 Fundamentals certification exam may subsist your subsequent career move.
The IBM DB2 9 certification system
a near examination of the IBM certification roles purchasable rapidly displays that, in an pains to gain a specific DB2 9 certification, you should select and stream one or extra assessments which acquire been designed above everything for that certification function. (every exam is a application-primarily based examination it is neither platform -- nor product-selected.) for that reason, after you acquire chosen the certification duty you exigency to pursue and familiarized your self with the requirements for that specific function, the next step is to build together for and select the acceptable certification tests.
making ready for the IBM DB2 9 certification exams
if you acquire experience the usage of DB2 9 in the context of the certification duty you acquire chosen, you may likewise already possess the talents and capabilities crucial to stride the examination(s) required for that position. besides the fact that children, in case your experience with DB2 9 is proscribed (and besides the fact that it is not), you can build together for any of the certification checks accessible by using taking odds of right here materials:
IBM learning features presents lessons which are designed to back you build together for DB2 9 certification. a catalogue of the courses which are informed for each and every certification exam may likewise subsist organize the usage of the Certification Navigator device supplied on IBM's "professional Certification software from IBM " internet site. informed courses can likewise subsist organize at IBM's "DB2 records management" internet web site. For more information on course schedules, places, and pricing, contact IBM getting to know features or consult with their internet web page.
IBM presents a collection of seven interactive on-line tutorials designed to build together you for the DB2 9 Fundamentals examination (exam 730). IBM likewise presents a train of interactive online tutorials designed to build together you for the DB2 9 for Linux, UNIX, and windows Database Administration exam (exam 731) and the DB2 9 family utility evolution exam (exam 733).
all of the counsel you should pass any of the attainable certification checks will likewise subsist organize in the documentation that is provided with DB2 9. a complete set of manuals comes with the product and are attainable in the course of the tips core upon getting installed the DB2 9 application. DB2 9 documentation can even subsist downloaded from IBM's internet web site in both HTML and PDF formats. @39202
Self-analyze books (similar to this one) that seat of attention on one or more DB2 9 certification tests/roles are likewise purchasable. every one of these books may likewise subsist discovered at your endemic bookshop or ordered from many online booklet retailers. (a list of workable reference materials for each and every certification exam may likewise subsist discovered the usage of the Certification Navigator appliance supplied on IBM's "expert Certification software from IBM" web web site.)
moreover the DB2 9 product documentation, IBM often produces manuals, known as "RedBooks," that cowl advanced DB2 9 theme matters (in addition to other issues). These manuals can subsist organize as downloadable PDF files on IBM's RedBook net web page. Or, if you prefer to acquire a certain tough copy, that you may attain one for a modest cost by pass of following the applicable hyperlinks on the RedBook internet site. (There is no cost for the downloadable PDF files.)
ambitions that give an profile of the basic themes that are covered on a specific certification examination may likewise subsist organize using the Certification Navigator appliance offered on IBM's "skilled Certification software from IBM" internet site. exam goals for the DB2 9 household Fundamentals examination (examination 730) can likewise subsist organize in Appendix A of this e-book.
sample questions and sample assessments can back you develop into close with the format and wording used on the specific certification assessments. they could assist you resolve no matter if you possess the potential mandatory to stream a selected examination. sample questions, along with descriptive solutions, are offered at the conclusion of each chapter during this ebook and in Appendix B. sample assessments for each DB2 9 certification position accessible will likewise subsist organize using the Certification examination appliance offered on IBM's "professional Certification program from IBM" web site. there is a $10 can saturate for every examination taken.
it is censorious to notice that the certification checks are designed to subsist rigorous. Very unavoidable answers are anticipated for many exam questions. on account of this, and because the latitude of cloth covered on a certification exam is continually broader than the abilities base of many DB2 9 gurus, consequence certain to select talents of the exam guidance components obtainable if you wish to assure your success in acquiring the certification(s) you want.
The relaxation of this chapter details everything attainable DB2 9 certifications and comprises lists of counseled items to grasp before taking the examination. It likewise describes the structure of the checks and what to hope on examination day. read the comprehensive Chapter 1: A ebook to the IBM DB2 9 certification exam to subsist trained more.
utility huge Oracle just stated fourth quarter income that beat the consensus of Wall road analysts despite a 6 percent lower in hardware income.
The debilitated point in hardware despatched shares down with the aid of more than four percent in after-hours buying and selling. Oracle pointed out that in the wake of its acquisition of solar Microsystems a year in the past, the business is focusing extra on promoting a lessen volume of hardware at a higher profit margin. That technique of transition is quiet underway as that you can examine in my liveblog insurance from the income conference title beneath.
2:12 pm: And the title is underway. President Safra Catz is making some opening remarks.
There’s the primary reference to hardware. “We’re running the sun enterprise in a greater income-conscious manner than before.” Hardware low margins acquire been fifty six percent. Later this 12 months I forecast the growth in the sun items to subsist “rather obtrusive.”
“We may well subsist returned at pre-solar operating margins relatively straight away as there continues to subsist loads of leverage in their working mannequin.”
Catz: “we acquire $29 billion in cash and marketable securities.”
counsel: As you subsist aware, they had a fabulous Q1 final 12 months. Assuming exchange continues to subsist at current levels: recent application is anticipated to exhibit 10 to twenty p.c boom, hardware is plus or minus 5 p.c.
total income anticipated to grown 9 to 12 p.c non-GAAP.
EPS forty five to 48 non-GAAP.
2:17 pm: And right here’s Larry. “We’re already practically twice as massive as IBM, and taking share faraway from them in databases.”
We did a yoke of cloud computing deals. They did a deal with Salesforce.com this 12 months. They did a select confidence of the largest and optimum names in cellular gadgets and cloud computing. (may he subsist referring to Apple?)
The expansion of their Exadata enterprise plus their Exalogic company, may quiet turbocharge their hardware company.
And here’s label Hurd. They sold a lot of application. application augment changed into broad based mostly. It was the first time we’ve ever sold more than $1 billion in apps.
Our sequential augment in Exadata turned into more than 50 percent. Proctor & Gamble, J.P. Morgan Chase and Apple (yes, Ellison changed into speakme about Apple previous) acquire helped us stride the 1,000-equipment threshold. (Paraphrasing Hurd there.)
2:21 pm: Time for mp;A from the analysts.
First query from Morgan Stanley: The hardware company: How cloth become the headwind relative to the shift within the mannequin? What offers you self assurance that you should secure it growing again? And a question about attach costs.
Hurd answers: he's explaining attach costs. We’ve moved to a mannequin the dwelling they acquire the service lined up to the sales activity. promoting instruments that haven't any low margin is handy to do. we're focused on selling hardware programs at a better rate, that are of a much better value to the client and that dwell installed longer.
question from Merrill Lynch: a query about counsel. how you could acquire incorporated a questionable macroeconomic forecast. And a second query about connect prices.
Larry jumps in: The connect cost to Exalogic and Exadata is 100 percent. They acquire become an even bigger fraction of their medium hardware company. That improves their profitability. Exadata is growing to subsist sooner than their commonplace sun line. They promote further and further engineered methods and fewer undifferentiated programs. This allows for us to augment their earnings of Middleware because it runs greater on Exalogic.
Ellison: They sell greater database and middleware on account of Exadata and Exalogic.
Catz on the economic system: We’ve received guys worldwide who roll in a forecast for us. but its very a all lot the equal. The actuality is the economic climate is as it is, and they continue to develop. This become an organic growth quarter for us. We’ve obtained loads of very Oracle-particular momentum going.
Hurd: They brought 800 individuals to the sales company this quarter. If that offers you a concept of their self credence of where the market is.
question from credit Suisse: question about the income drive alternate that the analyst focused on in his pre-income solemnize remaining month.
Hurd on the earnings force: They build extra territories within the realm by using getting greater density of coverage. They accept as loyal with we're beneath-dispensed. after they secure in front of extra consumers they sell more software.
Hurd: One salesperson had 20 customers. They feel that adult can sell just as an terrible lot utility calling on 5 shoppers.
Ellison: We’re going to add a few home equipment. One is a gargantuan reminiscence addition to Exadata for gargantuan records. As reminiscence turns into more affordable and bigger scale. We’ll subsist maxim within the drop at Oracle Openworld.
He’s now answering a query about Hadoop bins. He says they don’t supersede databases. The huge facts accelerator includes one of the vital open source accessories devotion Hadoop and a few other Oracle items that may pace up the MapReduce manner that Hadoop does. Oracle has at everything times adopted database technology tendencies…and saved up and reasonably often led on innovation.
Ellison: IBM nonetheless hasn’t Come out with an appliance that runs their DB2 database very quickly. in its dwelling they ran out and did an acquisition. (looks IBM is the going to subsist the sufferer of his verbal jabs this name, no longer Hewlett-Packard.)
question from J.P. Morgan: Hardware margins had been potent. The greater margin enterprise become more desirable than the low margin. but this is the 2d quarter in a row that hardware has decrased. Is it because the commodity company is shrinking quicker?
Hurd: Its just the basics of constructing a company. we're inserting greater insurance out out there. Making bound they connect everything the peripherals. They exigency to develop the reform line, but they wish to grow it correct. Getting these tall margin earnings is essential. You’re going to gawk fabric growth in Exadata and Exalogic. We’ll subsist focused on some competitors which acquire some key vulnerabilities.
Catz: They used to resell Hitachi, but the different massive storage they offered become LSI, which everything through the quarter became bought to NetApp. Their promoting of these storage items ordinary is down, however promoting their personal storage products is up.
Hurd: You survey the equal ingredient within the server enterprise. The larger margin products acquire higher growth prices, and the x86 line is slower.
Catz: They survey offers are available that aren’t ecocnomic and so they walk far from them. They wish to consequence funds. We’re silly that approach.
question from UBS: about the forecast for brand recent license revenue.
Catz: They everything the time acquire some spillover. They gawk at what the guys are forecasting. The Exadata and Exlogic methods definitely back because you exigency to purchase application. On the app facet, we’ve been on a roll. I add my own minute bit of conservatism. The summer season means chasing the contracts whereas individuals are on vacation.
question for Elllison: You thought there would subsist 50 to 100 shoppers for Oracle Fusion.
Ellison: we've a number of Fusion shoppers that are reside, and it’s being rolled out fully. We’re the simplest utility supplier that offers the selfsame technology on their cloud, or you can build it for your deepest cloud. And if you want we’ll sprint it for you.
Ellison: They respect we’ve been competing very smartly with SAP, very readily. They acquire no solutions regarding the cloud at all. They acquire nothing. (okay, now SAP receives a minute little bit of Larry’s abuse.)
query from Lazard Capital: a query about Exalogic. What’s riding the boom and are there any big consumer wins?
Hurd: With Exalogic you retract to Java applications and want to pace them up versus if you befall to’re operating them on x86. It’s a really fascinating value proposition.
question from Wells Fargo: you acquire lots of money on the stability sheet. How are you brooding about acquisitions? Valuations aren’t exactly low. (Oracle has $29 billion.)
Ellison: They had 19 p.c boom with out acquisitions. they will grow via acquisitions when they are attractive and consequence experience. at this time they aren’t and so they aren’t doing them. right now we’re focusing on organic growth, which skill expanding the revenue drive and introducing recent products. They suppose they acquire an terrible lot to sell. they will grow by pass of acquistions when the chance presents itself and when the economics consequence feel. at the instant they don’t consequence feel.
Catz: each as soon as in awhile they learn a jewel. cost does weigh number to us. They simply are looking to subsist unavoidable it’s an excellent business case when they achieve it. expenses acquire recently been fairly ridiculous.
And now a observe-up query on Catz’s prior observation on returning to pre-sun working margins.
Catz: They ingested a funds-dropping hardware company and they nonetheless acquire the optimum operating margins within the software business. There isn't any explanation why this year couldn’t subsist basically dazzling.
With the application enterprise and the colossal installed base who renew with us every year, there’s nevertheless lots of latitude left in their mannequin.
And that’s a wrap!
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The following excerpt from DB2 9 Fundamentals: Certification study guide, written by Roger E. Sanders, is reprinted with permission from MC Press. Read the complete Chapter 1, A steer to the IBM DB2 9 certification exam if you respect taking a DB2 9 Fundamentals certification exam might subsist your next career move.
The IBM DB2 9 certification process
A near examination of the IBM certification roles available quickly reveals that, in order to obtain a particular DB2 9 certification, you must select and pass one or more exams that acquire been designed specifically for that certification role. (Each exam is a software-based exam that is neither platform -- nor product-specific.) Thus, once you acquire chosen the certification role you wish to pursue and familiarized yourself with the requirements for that particular role, the next step is to prepare for and select the appropriate certification exams.
Preparing for the IBM DB2 9 certification exams
If you acquire experience using DB2 9 in the context of the certification role you acquire chosen, you may already possess the skills and information needed to pass the exam(s) required for that role. However, if your experience with DB2 9 is limited (and even if it is not), you can prepare for any of the certification exams available by taking odds of the following resources:
IBM Learning Services offers courses that are designed to back you prepare for DB2 9 certification. A listing of the courses that are recommended for each certification exam can subsist organize using the Certification Navigator appliance provided on IBM's "Professional Certification Program from IBM " Web site. Recommended courses can likewise subsist organize at IBM's "DB2 Data Management" Web site. For more information on course schedules, locations, and pricing, contact IBM Learning Services or visit their Web site.
IBM offers a train of seven interactive online tutorials designed to prepare you for the DB2 9 Fundamentals exam (Exam 730). IBM likewise offers a train of interactive online tutorials designed to prepare you for the DB2 9 for Linux, UNIX, and Windows Database Administration exam (Exam 731) and the DB2 9 Family Application evolution exam (Exam 733).
All the information you exigency to pass any of the available certification exams can subsist organize in the documentation that is provided with DB2 9. A complete set of manuals comes with the product and are accessible through the Information seat once you acquire installed the DB2 9 software. DB2 9 documentation can likewise subsist downloaded from IBM's Web site in both HTML and PDF formats. @39202
Self-study books (such as this one) that focus on one or more DB2 9 certification exams/roles are likewise available. Most of these books can subsist organize at your local bookstore or ordered from many online bespeak retailers. (A listing of workable reference materials for each certification exam can subsist organize using the Certification Navigator appliance provided on IBM's "Professional Certification Program from IBM" Web site.)
In addition to the DB2 9 product documentation, IBM often produces manuals, known as "RedBooks," that cover advanced DB2 9 topics (as well as other topics). These manuals are available as downloadable PDF files on IBM's RedBook Web site. Or, if you prefer to acquire a bound difficult copy, you can obtain one for a modest fee by following the appropriate links on the RedBook Web site. (There is no saturate for the downloadable PDF files.)
Objectives that provide an overview of the basic topics that are covered on a particular certification exam can subsist organize using the Certification Navigator appliance provided on IBM's "Professional Certification Program from IBM" Web site. Exam objectives for the DB2 9 Family Fundamentals exam (Exam 730) can likewise subsist organize in Appendix A of this book.
Sample questions and sample exams allow you to become close with the format and wording used on the actual certification exams. They can back you resolve whether you possess the information needed to pass a particular exam. Sample questions, along with descriptive answers, are provided at the cease of every chapter in this bespeak and in Appendix B. Sample exams for each DB2 9 certification role available can subsist organize using the Certification Exam appliance provided on IBM's "Professional Certification Program from IBM" Web site. There is a $10 saturate for each exam taken.
It is famous to note that the certification exams are designed to subsist rigorous. Very specific answers are expected for most exam questions. Because of this, and because the compass of material covered on a certification exam is usually broader than the information base of many DB2 9 professionals, you should select odds of the exam preparation resources available if you want to guarantee your success in obtaining the certification(s) you desire.
The ease of this chapter details everything available DB2 9 certifications and includes lists of suggested items to know before taking the exam. It likewise describes the format of the exams and what to hope on exam day. Read the complete Chapter 1: A steer to the IBM DB2 9 certification exam to learn more.
Take a gawk at the four primary statements of DML: Select, Update, Insert, and Delete. You will learn the duty each of these can play in your efforts to master DB2. You will likewise gawk at various aspects of SQL, a necessary language to understand though the comprehension flush will vary depending on the user's activity.This chapter is from the bespeak
In the previous chapter, they discussed the definitions of various database objects using the Data Definition Language (DDL). In this chapter, they start manipulating the database objects using the portion of SQL known as Data Manipulation Language (DML). They will subsist populating (inserting) data into the database and retrieving the data using many powerful methods. Depending on the sophistication of the database users, they can utilize SQL to query the database. The majority of the SQL statements within a DB2 application involve DML statements. Therefore, application developers must understand the various methods of inserting, updating, and retrieving data from the database. They will start with simple retrieval statements and gradually introduce more complicated methods of data manipulation. The DB2 Certification database will subsist used for most of the examples. There are four main DML SQL statements they consider: SELECT, INSERT, UPDATE, and DELETE.
SQL is based on mathematical principles, specifically on set theory and relational algebra. The data is stored in the database as unordered sets of data records. SQL is a set-oriented language, and many of its language elements are directly related to relational algebraic terms, such as permutation, projection, restriction, and join.
A set of data is represented in a DB2 database as a table or a view and is stored in a DB2 table without respect to order. To retrieve data in a particular order, an ORDER BY phrase must subsist added to a SELECT statement. Similarly, if the data is to subsist grouped, then a GROUP BY phrase must subsist added to the statement.
Now, let's review the DB2CERT database design defined in the previous chapter and exploit data using various SQL statements. There are three main tables: CANDIDATE, TEST, and TEST_CENTER. Each table represents a set of records that correspond to a test candidate (person), a test, and a test seat (location).
There is an associative table, known as the TEST_TAKEN table, that is used to reflect the relationships among the three main tables. The TEST_TAKEN table is used to schedule the test candidates and likewise to maintain their test scores.
The longest SQL statement is 32,765 bytes.
Remember that to execute any operation, the user must acquire the necessary privileges.Retrieving the Entire Table
The most basic of everything retrieval command involves the SELECT statement with no operators other than the title of the table. This SQL statement retrieves everything of the candidates who acquire taken a DB2 Certification exam. The information requested is contained in the table TEST_TAKEN.SELECT * FROM db2cert.test_taken
SQL is a data access language that consists of language statements and clauses. There are many optional clauses that can subsist used to modify the output. The output of a SELECT statement is known as a result set or result table. The results from the SELECT statement are shown next. In this example, using an asterisk or star character (*) for column selection, the columns will subsist returned to the user in the order in which they are defined in the table.CID TCID NUMBER DATE_TAKEN START_TIME FINISH_TIME SCORE PASS_FAIL SEAT_NO --- ---- ------ ---------- ---------- ----------- ----- --------- ------- 111 TX01 500 01/01/2000 11:30:00 12:30:00 65 Y 1 111 TX01 501 02/02/2000 10:30:00 11:45:00 73 Y 1 111 TX01 502 03/03/2000 12:30:00 13:30:00 67 Y 1 222 TR01 500 01/01/2000 14:00:00 15:30:00 55 N 2 222 TR01 502 01/02/2000 09:00:00 10:15:00 53 N 2 222 TR01 502 02/18/2000 10:00:00 11:30:00 75 Y 2 333 TX01 500 03/01/2000 11:30:00 13:00:00 82 Y 2 333 TX01 501 12/29/2000 14:00:00 - - - 1 333 TX01 502 03/02/2000 14:00:00 14:30:00 92 Y 1 9 record(s) selected.
In SQL, the * is used to witness that everything columns of a table are being referenced. In this example, the SQL statement refers to everything of the columns defined for the DB2CERT.TEST_TAKEN table. If the table is altered and a recent column is added to the table definition, the result set would contain the recent column.
Adding a recent column to an existing table will result in default values being populated for the existing rows.
Since the output of the SQL statement using * character varies according to the table definition, it is recommended that you specify everything of the column names you want to survey in the SELECT statement. They could acquire obtained the selfsame result as the statement using SELECT * with the following SQL statement.SELECT cid, tcid, number,date_taken,start_time, finish_time,score,seat_no FROM db2cert.test_taken;
The * character is used to refer to everything of the columns defined for a table. The order of the columns in the result table is the selfsame order as specified in the CREATE TABLE or CREATE VIEW statement.
What is returned to the user is known as the result set. If the result set is big it is advisable to subsist certain to filter the data using a WHERE predicate.
The FROM clause is required for the DML SQL statement, since it describes the location (table or view) of the data. Their case references a lone table called DB2CERT.TEST_TAKEN. The SELECT and FROM clauses are required in everything data retrieval statements. The list of columns following the SELECT keyword is referred to as the select list.Projecting Columns from a Table
Projection is a relational operation that allows you to retrieve a subset of the defined columns from a table. The next case restricts the output from the SELECT command so that only the candidate ID, test center, and test number attributes from the TEST_TAKEN table are shown.SELECT cid,tcid,number FROM db2cert.test_taken
The output of this SELECT statement is shown below.CID TCID NUMBER --- ---- ------ 111 TX01 500 111 TX01 501 111 TX01 502 222 TR01 500 222 TR01 502 222 TR01 502 333 TX01 500 333 TX01 501 333 TX01 502 9 record(s) selected.
The order of the columns in the result table will always match the order in the select list. The order of the columns as they were defined in the CREATE TABLE or CREATE VIEW statement is ignored when a select list is provided in the SQL statement. In this example, the order of the columns is similar to the order in the CREATE TABLE statement, since the CID column was defined prior to TCID and NUMBER columns.Changing the Order of the Columns
Permutation is the relational operation that allows you to change the order of the columns in your result table. Permutation is used every time you select columns in an order different than the order defined in the CREATE TABLE statement. For example, to parade the test seat ID prior to the candidate IDs and the test number, you could execute the following:SELECT tcid,cid,number FROM db2cert.test_taken
The result of this SELECT statement specifies a select list in a different order than was defined in the table definition.TCID CID NUMBER ---- --- ------ TX01 111 500 TX01 111 501 TX01 111 502 TR01 222 500 TR01 222 502 TR01 222 502 TX01 333 500 TX01 333 501 TX01 333 502 9 record(s) selected.
We refer to the output of a SELECT statement as the result table because the output of everything SELECT statements can subsist considered a relational table.Restricting Rows from a Table
Restriction is a relational operation that will filter the resulting rows of a table. Restriction can subsist accomplished through the utilize of predicates defined in a SQL WHERE clause. To restrict the result set, they exigency to add a WHERE clause to the SQL statement.
A predicate is a condition placed on the data. The result of the condition is TRUE, FALSE, or UNKNOWN.
The WHERE clause specifies conditions or predicates that must subsist evaluated by DB2 before the result table is returned to the cease user. There are many valid types of predicates that can subsist used. In the following example, the equality (=) predicate is used to restrict the records to only those candidates who acquire taken a DB2 Certification test at the test seat TR01.SELECT tcid,cid FROM db2cert.test_taken WHERE tcid ='TR01'
The WHERE clause likewise accepts other comparison operators, such as greater than (>), less than (<), greater than or equal to (>=), less than or equal to (<=), and not equal to (<>).This statement is an case of a basic predicate. A basic predicate compares two values. In addition, more complicated predicates, such as LIKE, BETWEEN, and IN, are likewise valid and will subsist discussed later.
Trying to execute this case SQL statement will result in a data character compatibility error, because the column TCID is defined with a user-defined data character (UDT).Predicate Evaluation for UDTs
The column TCID was defined as a user-defined data type. To consequence the comparison in the WHERE clause valid, a casting duty needs to subsist used. This is not mandatory if the comparison is to a literal or host variable. This technique is however demonstrated below:SELECT tcid, cid FROM db2cert.test_taken WHERE tcid=CAST('TR01' AS db2cert.center_id)
Predicate evaluation requires that the data types subsist compatible (same data character or a compatible data type). They can accomplish the data character conversion (cast) using one of two methods:
Refer to Chapter 15, "Object Relational Programming," for more information on casting for UDTs.
Although not always mandatory, casting is recommended to ensure compatible data types are compared, including length and scale. This allows DB2 to resolve these as indexable rather than stage 2 predicates.Restricting Rows Using Multiple Conditions
It is workable to combine multiple conditions (predicates) in a lone SQL statement. The predicates can subsist combined using Boolean operators, such as the AND or OR operators. These operators allow you to combine multiple conditions in a lone SQL statement. The order of the predicate evaluation will not impress the result set (known as set closure).
The next case retrieves the records for the test candidates who took a test at test seat TR01 and achieved a score greater than 65. The rows that fullfil the predicates are known as the qualifying rows. The following case is an SQL statement using multiple predicates:SELECT tcid,cid,score FROM db2cert.test_taken WHERE tcid= CAST('TR01' AS db2cert.center_id) AND score > 65 Selecting Columns from Multiple Tables
There are basically two operations that combine columns from multiple tables in a lone SQL statement. These operations areCartesian Product
A Cartesian product is a relational operation that will merge everything the values from one table with everything the values from another table. This operation is not used frequently because the result table can subsist very large. The number of rows in the result table is always equal to the product of the number of rows in the qualifying rows for each of the tables being accessed.
The DB2 optimizer may select to utilize a Cartesian product of unrelated tables if this is deemed to subsist an efficient manner of accessing multiple tables. An case would subsist two single-row tables that are joined with a big table. The cross-product of 1 ∴ 1 = 1; thus the big table access is deferred as late as possible, with a potential augment in the restrictive predicates that can subsist applied without incurring the overhead of a big Cartesian result. This manner of table access is typical in processing queries against a star schema data model.
The following case is a Cartesian product of everything test numbers and test names from the TEST table, with everything candidates from the TEST_TAKEN table. First, select from the TEST table.SELECT number, title FROM db2cert.test NUMBER NAME ------ -------------------------------------------------- 500 DB2 Fundamentals 501 DB2 Administration 502 DB2 Application Development 3 record(s) selected. Next select of everything candidates from the test_taken table. SELECT cid,tcid FROM db2cert.test_taken CID TCID --- ---- 222 TR01 222 TR01 222 TR01 111 TX01 111 TX01 111 TX01 333 TX01 333 TX01 333 TX01 9 record(s) selected.
Then combine the two tables to profile a Cartesian product result table.SELECT db2cert.test_taken.number,cid,tcid FROM db2cert.test_taken,db2cert.test NUMBER CID TCID ------ --- ---- 500 111 TX01 501 111 TX01 502 111 TX01 500 222 TR01 502 222 TR01 502 222 TR01 500 333 TX01 501 333 TX01 502 333 TX01 500 111 TX01 501 111 TX01 502 111 TX01 500 222 TR01 502 222 TR01 502 222 TR01 500 333 TX01 501 333 TX01 502 333 TX01 500 111 TX01 501 111 TX01 502 111 TX01 500 222 TR01 502 222 TR01 502 222 TR01 500 333 TX01 501 333 TX01 502 333 TX01 27 record(s) selected.
There are two tables referenced in the FROM clause of this query. The tables are separated by commas. There is no relationship expression in the WHERE clause. This character of query results in a Cartesian product.
The result table is a representation of everything workable combinations of the input tables. The TEST table has three rows, and the TEST_TAKEN table has nine rows. Therefore, the SELECT statement shown above returns 27 rows. Note the first column title in this query. It is necessary to fully qualify the column title by providing the schema title and table title with the column title because this column exists in both the TEST table and TEST_TAKEN table. In this case, they needed to specify that the NUMBER column is to subsist retrieved from the DB2CERT.TEST_TAKEN table and not from the DB2CERT.TEST table.
By adding a predicate to a Cartesian product SQL query, the result table can delineate a more useful representation of the data. In the case below, the query represents everything of the tests that were taken by the candidate whose ID is 111.SELECT db2cert.test_taken.number,cid,tcid FROM db2cert.test_taken,db2cert.test WHERE cid='111' NUMBER CID TCID ------ --- ---- 500 111 TX01 500 111 TX01 500 111 TX01 501 111 TX01 501 111 TX01 501 111 TX01 502 111 TX01 502 111 TX01 502 111 TX01 9 record(s) selected.
Adding a WHERE clause to your query does not always provide the desired result. In the case shown above, you want to know everything of the tests that were taken by the candidate whose ID is 111, and the query returns nine rows. But they know from previous queries that the candidate took only three tests. The query in the case above has a WHERE clause to filter out the candidate whose ID is 111 from the TEST_TAKEN table, but there was no filter on the TEST_CENTER table. Therefore, the result of the query would always subsist a multiple of the number of testing centers. Usually, when multiple tables are referenced, you should embrace a cross-table relationship using a table merge or relate method, as shown in the following example. They will examine table relate methods further in the next section.SELECT db2cert.test_taken.number,cid,tcid FROM db2cert.test_taken,db2cert.test WHERE cid= '111' AND db2cert.test_taken.number=db2cert.test.number NUMBER CID TCID ------ --- ---- 500 111 TX01 501 111 TX01 502 111 TX01 3 record(s) selected.
To avoid data redundancy, it is recommended that the database tables subsist normalized. Following a normalization process, a number of related tables will exist. To fullfil some of the required queries, the tables must subsist reconstructed. The tables are reconstructed temporarily, using a table relate strategy to produce a single-result table.
The result tables in the previous examples usually provided candidate ID numbers and not the complete title of the test candidates. The candidate IDs are stored in the TEST_TAKEN table, and the full names are stored in the CANDIDATE table. To obtain the title of a candidate, the data must subsist retrieved from the CANDIDATE table, using a relationship or relate strategy.
Consider an case that will list the names and phone numbers of candidates who were registered to select a DB2 Certification test in 2000. To accomplish this, they exigency to select data from two different tables:
Let's retrieve a list of candidate names, phone numbers, and IDs from the CANDIDATE table. The candidate names were stored in multiple columns to allow for effortless retrieval by terminal name.SELECT fname,initial,lname,hphone,cid FROM db2cert.candidate
The output of this case follows. Pay special attention to the values in the CID column. It will subsist used as the relate column in the next example.FNAME INITIAL LNAME HPHONE CID -------- ------- ---------- ---------- --- Bill B Wong 1115551234 111 George Baklarz 2226543455 222 Susan M Visser 4442314244 333 Glen R Sheffield 5552143244 444 Jim G Stittle 6662341234 555 Kevin W Street 7773142134 666 Bert F Nicol 8886534534 777 Paul C Zikopoulos 9992112212 888 8 record(s) selected.
Now, let's retrieve the ID numbers of those candidates who were registered to select the test in 2000.SELECT several cid FROM db2cert.test_taken WHERE YEAR(date_taken) = 2000 CID --- 222 111 333 3 record(s) selected.
The candidate IDs in the TEST_TAKEN table must correspond to a candidate ID in the CANDIDATE table because of the declarative referential integrity constraints. The parent table in the relationship is the CANDIDATE table and the child table (dependent table) is the TEST_TAKEN table.
The result table from the above query does not embrace the test candidate 444, since that candidate did not acquire a test scheduled for 2000. They exigency to relate the two result tables based on the candidate ID values. This column is known as the relate column.
Query performance can significantly better if the relate columns are appropriately indexed.
The following lone query will fullfil the end-user requirement.SELECT several fname,initial,lname,hphone FROM db2cert.test_taken,db2cert.candidate WHERE YEAR(date_taken) = 2000 AND db2cert.test_taken.cid=db2cert.candidate.cid
A table relate requires a predicate that includes an expression based on columns from the tables referenced in the FROM clause. This is known as a relate predicate. The FROM clause has not changed from the Cartesian product examples. The only dissimilarity is in the relate predicate (test_taken.cid = candidate.cid).
An alternative profile of the FROM clause for joins involves explicitly coding the relate keyword between the tables (rather than using a comma) and coding the relate predicates in the ON clause rather than in the WHERE clause. This manner of coding will subsist covered in more detail in Chapter 4, "Advanced SQL Coding."
The table names needed to subsist explicitly stated because there is a column named CID in both of the referenced tables. When multiple tables are being accessed in a lone query, any selected columns that occur in more than one table must subsist qualified with the table name.
An error will occur if the columns being referenced are abstruse (not properly qualified).
The maximum number of base tables that can subsist in a lone SQL statement is 225; however, you are limited to 15 tables in a relate (the FROM clause).
The 15-table restrict can subsist increased by updating the macro SPRMMXT to a value greater than 15.
This kind of relate operation shown in the above case is likewise known as an inner join. An inner relate displays only the rows that are present in both of the joined tables.Using Correlation Names
If each of the columns needed to subsist fully qualified with the table name, such as tableschema.tablename.columnname, the queries would become very big and cumbersome to toil with. Fortunately, there is an easier pass to qualify the abstruse columns resulting from a multitable SELECT statement.
The columns can subsist qualified using a correlation name. A correlation title is a temporary alias for the tables referenced in an SQL statement. They rewrite the previous query using correlated names as follows:SELECT several fname,initial,lname,hphone FROM db2cert.test_taken tt, db2cert.candidate c WHERE YEAR(date_taken) = 2000 AND tt.cid = c.cid
The correlation title immediately follows the title of the table as stated in the FROM clause. In this example, the correlated title for the TEST_TAKEN table is tt, and the correlated title for the CANDIDATE table is c.
Correlation names can subsist optionally prefixed with the AS keyword, such as DB2CERT.CANDITATE AS C. This is purely for readability.
The correlated names are accessible within the SQL statement only. Following the execution of the SQL statement, the correlation title is no longer defined. Once a correlation title has been defined, it can subsist referenced in the ease of the query instead of the table name. However, the table title can quiet subsist referenced.
Use simple, easy-to-remember correlation names. Table initials are suitable candidates for correlation names.Sorting Your Output
We acquire been retrieving data from one or more tables. The order of the result table has not been specified in any of the SQL statements. Therefore, the data is retrieved in an undetermined order if there is no ORDER BY clause in the SQL statement.
The only guaranteed pass to return data in the required sequence is with the ORDER BY clause. Any data retrieval that is currently returned in sequence without this clause is purely based upon the data retrieval manner at the time. A future access path change may not return the data in the selfsame sequence.
The following case produces a list of the test candidates in alphabetical order by terminal title for the candidates who acquire taken a DB2 Certification test at the TR01 test center.SELECT lname,initial,fname FROM db2cert.candidate c,db2cert.test_taken tt WHERE c.cid=tt.cid AND tcid='TR01' ORDER BY lname
This case contains a recent clause, ORDER BY. After the ORDER BY clause, you can list the columns that will specify the sort order and the character of sort.
Appropriate indexing may allow DB2 to avoid sorting the data to match the ORDER BY clause. If the data is already sequenced via the index, DB2 may select to utilize the index and avoid sorting the data. DB2 cannot avoid a sort for an ORDER BY involving columns from more than one table. Where possible, embrace columns from only one table in the ORDER BY to give DB2 greater opportunity for sort avoidance.
The SQL can subsist modified so that the output is changed to descending order by terminal title and a secondary order column on the first title in ascending order.SELECT lname,fname,hphone FROM db2cert.candidate c,db2cert.test_taken tt WHERE c.cid=tt.cid AND tcid= 'TR01' ORDER BY lname DESC, fname
In this example, the DESC keyword that follows the lname column indicates that the result table should subsist in descending order based on the terminal name. More than one record can acquire the selfsame terminal name. This situation is quite common. There is a second column specified in the ORDER BY clause, fname. There is no keyword specifying the sort sequence based on the fname column. Therefore, the default ordering sequence (ascending) is used.
The next case contains three columns lname, fname, and hphone. You can reference the column that should subsist used to sort the data using the column title or by specifying its position in the select list. Using the column position is useful when the column in the select list is made up of derived columns (calculated columns) that acquire no categorical name.SELECT lname,fname,hphone FROM db2cert.candidate c,db2cert.test_taken tt WHERE c.cid=tt.cid AND tcid='TR01' ORDER BY 1 DESC, 2
In this example, the sort order is specified using the column position. Therefore, the query result is exactly the selfsame as the in previous example.
You can likewise allot an alternative column title using column renaming. The assigned title can then subsist referenced in the ORDER BY clause, and it appears as the column heading where appropriate.
Although useful, coding a column position rather than a column (or renamed column) in the ORDER BY clause may lead to a different sequence if another column is inadvertently added to the query that alters the column positioning.
The ORDER BY clause must succeed everything subselects in the FULLSELECT statement. The only clauses that can succeed the ORDER BY clause are the for FOR FETCH ONLY, FOR READ ONLY, OPTIMIZE, WITH QUERYNO, FETCH FIRST n ROWS clauses.Derived Columns
There are some cases when you will exigency to accomplish calculations on the data. The SQL language has some basic mathematical and string functions built in. Mathematical operations embrace gauge addition, subtraction, multiplication, and division.
The calculation can subsist defined in the WHERE clause of the SQL statement or the select list. Suppose that you exigency to compute a passing rate for a DB2 test. The passing rate is defined as the percentage of candidates that pass the test (totalpassed*100/totaltaken). The following SQL statement will accomplish this for us for test number 500:SELECT number, totalpassed*100/totaltaken FROM test WHERE number='500'
In this example, the second column of the output list is a calculated column. recall that you must utilize the column position if you want to utilize this calculated column for the ORDER BY clause unless you title it (as they now discuss).
Occasionally, the results of a derived column may not parade as expected. The case using totalpassed*100/totaltaken will result in a value of 66 being retrieved. Since both the totalpassed and totaltaken columns are integers, the final result is likewise an integer, and the fractional fraction is discarded. If this is not your desired result, you should utilize other functions (like decimal) to change the pass the calculation is performed or displayed.Naming Derived/Calculated Columns
You can specify a column title for any expression. When you provide the derived (calculated) column with a name, the ORDER BY clause can reference the derived title to allow for a more readable SQL statement.
The following SQL calculates the percentage of people that acquire passed the DB2 Certification exams and orders the output in descending order of the passing rate.SELECT number,totalpassed*100/totaltaken AS PassedRate FROM test ORDER BY PassedRate DESC
The AS clause is used to rename the default title of an ingredient in the select list. In this example, they are giving the title of PassedRate to the result of the division of columns totalpassed by totaltaken. The named column is used in the query to specify the column that should subsist used for sorting the output.
The AS keyword is optional, although it should subsist added for readability. Without the AS clause, it may subsist unclear whether the intention was to rename a column or a comma was missed between two retrieved columns.Functions
In DB2, there are different types of functions provided. For example, two types of functions provided by DB2 are scalar and column functions (a third character of duty called a table duty is discussed in Chapter 15, "Object Relational Programming."
Scalar functions (also known as row functions) provide a result for each row of the result table. A scalar duty can subsist used any dwelling an expression is allowed.
Column functions (also known as vector functions) toil with a group of rows to provide a result. The group is specified using a FULLSELECT and optionally grouped using the GROUP BY clause.
In this section, they introduce you to some of the SQL functions provided with DB2. SQL functions are categorized by their implementation type. Either the functions are built in or they are extensions of DB2 and are known as user-defined functions (UDFs).
Built-in functions are defined within the SQL standards, and they are provided by DB2. These can subsist either scalar or column functions.
UDFs are not defined within the SQL standards because they are extensions of the current SQL language. These functions can subsist developed by a DB2 administrator or application developer. UDFs can subsist either scalar or table functions, but not column functions. Once the UDFs acquire been created, they can subsist invoked by any cease user with the proper privileges. For more information about UDFs, refer to Chapter 15.
Scalar functions are applied to each row of data, and there is a per-row result provided. If they want to retrieve only the first three digits of telephone numbers for each candidate, they could utilize a scalar function. The duty that is used is called SUBSTR. The arguments for this duty embrace a string data character column, a genesis offset, and length. The output data character and impute of the duty depend on the input data character and attribute. The following case retrieves the telephone zone code for the column wphone.SELECT lname, SUBSTR(CHAR(wphone),1,3) FROM db2cert.candidate
The SUBSTR duty is a scalar function. In this example, SUBSTR returns a character string of three characters. The result string corresponds to the first three characters of the wphone column. This duty is known as a string duty because it works with any string data type. If they wanted to provide the output column with a meaningful name, they could provide an alias, as was done for calculated columns.
In the case above, the substring starts from the genesis of the string, because they witness one (1) as the second parameter of the function. The length of the resulting string is indicated in the third argument. In their example, the length is three. Note that the data character of the wphone column is phone, so a casting duty is used to transfigure the phone data character to the char data type.
The following query will provide the month when the exam was taken. The input for this duty is a DATE string, and the output is an integer.SELECT fname, MONTH (date_taken) FROM candidate c, test_taken tt WHERE c.cid=tt.cid Column Functions
Column functions provide a lone result for a group of qualifying rows for a specified table or view. Many common queries can subsist satisfied using column functions where they embrace common tasks, such as finding the smallest value, the largest value, or the medium value for a group of data records. In the following case you can obtain the maximum length of time of any of the DB2 Certification exams:SELECT MAX("length") FROM test
Because the length column shares its title with the length scalar function, the column title is encased within double-quotes to distinguish this as a column and not a function.
If they added a WHERE clause to this example, the maximum would delineate the maximum length for the qualifying rows, since the predicate is used to filter the data prior to the application of the MAX function.
This next case calculates the medium of the number of seats for everything of the test centers. Notice the column duty AVG is used in this example:SELECT AVG(noseats) FROM test_center
DB2 provides many more built-in functions. If you are interested in calculating statistical information, you can utilize statistical functions, such as VARIANCE, STDDEV, or a sampling of these functions.
MAX and MIN functions can subsist either column or scalar functions depending on the input arguments.Grouping Values
Many queries require some flush of aggregated data. This is accomplished in SQL through the utilize of the GROUP BY clause. The following SQL obtains the medium number of seats for each country:SELECT country, AVG(noseats) FROM test_center GROUP BY country
This SQL statement obtains the medium number of seats per country, and the GROUP BY clause tells DB2 to group together the rows that acquire the selfsame values in the columns indicated in the GROUP BY list. In their example, they are grouping countries into subsets. As the subsets are created, DB2 calculates the medium of each of those groups or subsets, in this case, by each country.
When you combine column functions and other elements, such as column names, scalar functions, or calculated columns, you must utilize the GROUP BY clause. In this case, you must embrace every ingredient that is not a column duty in the GROUP BY list. The only elements that can subsist omitted in the GROUP BY list are constant values.
The next SQL statement obtains a list that includes the medium lop score and minimum test length for the DB2 Certification exams. They group this list by the character of exam, as follows:SELECT type, AVG(cut_score), MIN("length") FROM test GROUP BY type
Appropriate indexing can allow DB2 to avoid a sort to group the data rows to match the GROUP BY clause.
It is workable to sort the output of the previous case using an ORDER BY clause.
GROUP BY may return data in the selfsame order as an ORDER BY, but this is not guaranteed and is based upon the access path. The only manner to guarantee data sequence is with an ORDER BY.Restricting the utilize of Sets of Data
Up to now, they acquire discussed how to restrict output based on row conditions. With SQL, it is likewise workable to restrict that output using column functions and the GROUP BY clause. Suppose you want a list of everything the test centers that acquire administered more than five DB2 Certification exams. To consequence it easier to understand, let's first secure the number of tests that acquire been taken in each test center.SELECT tcid, count(*) FROM test_taken GROUP BY tcid
We utilize the weigh column duty to secure the total number of tests that acquire been taken in each test center. When you utilize an asterisk (*) with the weigh function, you are indicating that you want the number of rows in a table that meet the criteria established in the SQL statement. In this example, they are grouping by TCID because they acquire a number of occurrences for everything the test centers in the TEST_TAKEN table. The TEST_TAKEN table has an entry for every DB2 Certification exam that has been taken. Finally, the output is restricted to only those test centers that acquire administered more than four exams.SELECT tcid FROM test_taken GROUP BY tcid HAVING COUNT(*) > 4
This case introduces the HAVING clause. The HAVING clause is equivalent to the WHERE clause for groups and column functions. The HAVING clause will restrict the result set to only the groups that meet the condition specified in it. In their example, only the test centers that acquire administered more than four DB2 Certification exams will subsist displayed.Eliminating Duplicates
When you execute a query, you might secure duplicate rows in the reply set. The SQL language provides a special clause to remove the duplicate rows from your output. The following SQL generates a list of names and phone numbers for everything the candidates who acquire taken a test. In the following example, they purge the duplicate rows from their output list using the several clause.SELECT several fname,wphone,hphone FROM candidate c,test_taken tt WHERE c.cid=tt.cid
The several clause can likewise subsist used with the weigh function. When you utilize several inside a weigh function, it will not weigh the duplicate entries for a particular column. The following case allows you to weigh how many different test centers acquire candidates registered.SELECT COUNT(DISTINCT tcid) FROM test_taken
This case provides the number of test centers that are registered in the TEST_TAKEN table. recall that everything the candidates who acquire registered for DB2 Certification exams are stored in this table. consequence certain that you understand the dissimilarity between COUNT(*), COUNT(colname), and COUNT(DISTINCT colname). They are very similar in syntax but differ in function.
COUNT(*) returns a weigh of everything rows that qualify against the WHERE clause. COUNT(colname) returns a weigh of everything rows that qualify against the WHERE clause, with null occurrences of colname removed. COUNT(DISTINCT colname) counts several occurrences of colname, with nulls removed.Searching for String Patterns
SQL has a powerful predicate that allows you to search for patterns in character string columns. This is the devotion predicate. Suppose you want to generate a list of the candidates whose first title starts with the missive G.SELECT fname,lname,wphone,hphone FROM candidate WHERE fname devotion 'G%' ORDER BY lname,fname
In this query, they utilize a wildcard character with the devotion predicate. In SQL, the percent character (%) is a substitute for zero or more characters. The search string G% can subsist substituted with names devotion George, Gary, Ginger, and so on (since the percent character can substitute zero or more characters, the search string can likewise subsist a lone missive G).
The percent character can subsist used any dwelling in the search string. It likewise can subsist used as many times as you exigency it. The percent symptom is not case-sensitive, so it can select the dwelling of uppercase or lowercase letters. However, the constant characters included in your search string are case-sensitive.
Another wildcard character used with the devotion predicate is the underline character (_). This character substitutes one and only one character. The underline character can select the dwelling of any character. However, the underline character cannot subsist substituted for an vacant character.
If the pattern needs to search for occurrences of the wildcard characters % and _ as their actual values, then the escape clause is used to specify a character that precedes the percent or underscore in the pattern.
The previous SQL can subsist modified to embrace everything candidates' names and the telephone numbers for those candidates whose title has a lowercase missive "a" as its second letter.SELECT fname,lname,wphone,hphone FROM candidate WHERE fname devotion '_a%' ORDER BY lname,fname
This case uses two wildcard characters that toil with the devotion predicate. The search string in this case can embrace names, such as Paul, Gabriel, or Natalie. (The first character may subsist any character, the lowercase missive "a" is the second character in the string, and the string ends with any number of characters.)
When the pattern in a devotion predicate is a fixed-length host variable, the reform length must subsist specified for the string to subsist returned. 'G%' assigned to an 8-byte variable (LIKE :variable) will search for everything occurrences of 'G% ' (G, followed by any character, followed by 6 blank characters). To find rows that open with a G, then 'G%%%%%%%' should subsist assigned to the fixed-length variable.Searching for Data in Ranges
SQL likewise offers us a compass operator. This operator is used to restrict rows that are in a particular compass of values. respect the requirement to list those candidates whose scores in the DB2 Certification exam are between 60 and 75.SELECT several fname,lname,wphone,hphone FROM candidate c, test_taken tt WHERE c.cid=tt.cid AND score BETWEEN 60 AND 75
The BETWEEN predicate includes the values that you specify for searching your data. An famous fact about the BETWEEN predicate is that it can toil with character ranges as well.
In addition to the score requirement, this case modifies the SQL to embrace only those candidates whose terminal title begins with a missive between B and G.SELECT several fname,lname,wphone,hphone FROM candidate c, test_taken tt WHERE c.cid=tt.cid AND score BETWEEN 60 AND 75 AND lname BETWEEN 'B' AND 'GZ'
In this example, the second BETWEEN predicate contains character values. They exigency to specify the GZ value to embrace everything the workable names that start with the missive G. This was done assuming that the missive Z is the terminal workable value in the alphabet.
The arguments of the BETWEEN clause are not interchangeable; the first must specify the low value, and the second, the tall value. BETWEEN 1 AND 2 will return everything values within the compass (inclusive of 1 and 2). BETWEEN 2 AND 1 will return zero rows.Searching for Null Values
Null values delineate an unknown value for a particular occurrence of an entity. They can utilize a null value in the cases where they don't know a particular value of a column. Let's relate that they want a list of everything those candidates whose score is not yet input. This condition is represented with a null value.SELECT fname,lname,wphone,hphone FROM candidate c, test_taken tt WHERE c.cid=tt.cid AND score IS NULL
The IS predicate is used to search for the null value in this example. recall that the null value means "unknown." Because it has no particular value, it can't subsist compared with other values. You can't utilize conditional operands, such as equal (=) or greater than (>), with null values.Searching for Negative Conditions
The BETWEEN, IS, and devotion predicates always gawk for the values that meet a particular condition. These predicates can likewise subsist used to gawk for values that don't meet a particular criterion.
The NOT predicate can subsist used to gawk for the opposite condition, combined with the LIKE, BETWEEN, and IS predicate, to accomplish negative searches, as shown in the following example. This case has a devotion predicate combined with the NOT predicate. They want a list of those candidates whose terminal names achieve not start with the missive S.SELECT several fname,lname,wphone,hphone FROM candidate WHERE lname NOT devotion 'S%' ORDER BY lname,fname
The next case has a BETWEEN predicate combined with the NOT predicate. They want the list of those candidates whose score, in any test, is not in the compass 60 to 75.SELECT several fname,lname,wphone,hphone FROM candidate c, test_taken tt WHERE c.cid=tt.cid AND integer(score) NOT BETWEEN 60 and 75
In this example, the NOT predicate will exclude everything the values that are in the compass 60 to 75.
Negation can likewise subsist applied to the null value. This SQL produces a report that searches for those candidates that acquire a seat number assigned. This is expressed with a NOT NULL value.SELECT several fname,lname,wphone,hphone FROM candidate c, test_taken tt WHERE c.cid=tt.cid AND seat_no IS NOT NULL
The NOT operator can likewise subsist used to negate the gauge comparison operators, =, <, <=, >, and >=.
When dealing with nulls, NOT or negation may not return the opposite of the positive logic. For example, WHERE SEAT_NO = 1 will return only the rows for seat number 1. Any value other than 1 is discarded, as these rows are FALSE, including nulls, since these are unknown. WHERE SEAT_NO <> 1 excludes rows where the seat number is 1, and likewise discards nulls because these are unknown.Searching for a Set of Values
In SQL, it is workable to establish a restriction condition based on a set of values. Suppose that you exigency a list of the test centers that acquire candidates registered for the DB2 Fundamentals test and for the DB2 Application evolution test. This can subsist queried with the following statement:SELECT several name,phone FROM test_center tc, test_taken tt WHERE tc.tcid=tt.tcid AND (number = '500' or number ='502')
To simplify edifice multiple OR conditions when multiple values for the selfsame column are being compared, it is workable to rewrite the statement using the IN clause.SELECT several name,phone FROM test_center tc, test_taken tt WHERE tc.tcid=tt.tcid AND number IN ('500','502')
The IN clause is used to denote a set of values. In this example, they utilize a constant set of values.
You can likewise utilize the NOT predicate with the IN clause. In this case, the condition will subsist loyal when a value is not present in the set of values provided to the IN clause. You can utilize as many values as you wish in the IN clause, within the defined limits of the size of a SQL statement.Advanced Selection Functionality
In Chapter 4, "Advanced SQL Coding," they will gawk at more of the functionality and power of the SELECT statement. They will cover topics such as
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