Databases

DB2 Developer's Guide by Craig S. Mullins

By Craig S. Mullins

Examine the easiest recommendations and methods from professional writer Craig Mullins. practice those real-world items of recommendation, undocumented guidance, strategies, tasks, and methods for your personal database administration method. Mullins offers what you want to take your DB2 improvement to the subsequent level.Written through a developer for builders, DB2 Developer¿s consultant, 5th variation presents a solutions-oriented method of studying the root and features of this most modern model of the world¿s no 1 database administration system.LEARN THE recommendations AND construct THE functions * enforce leading edge shortcuts, advice, methods, innovations, and improvement instructions to optimize all features of DB2 improvement and management * comprehend the tips for binding DB2 program plans and programs * Use specialist suggestion to enforce disbursed DB2 functions * attach your DB2 databases to the realm broad internet * assessment exhaustive assurance of V6 topics¿including triggers, user-defined services, saved strategy extensions, predictive governing, hiperspace bufferpools, the REBUILD software, the DSSIZE parameter, user-defined detailed forms, auxiliary tables, and extra * learn implementation info and suggestions for big items to shop multimedia data¿such as audio, video, and images¿in your DB2 for OS/390 databases (BLOBs, CLOBs, DBCLOBs, and DB2 extenders) * learn the way and why to exploit the recent clarify tables - DSN_STATEMNT_TABLE and DSN_FUNCTION_TABLE * notice how one can enforce a procedural DBA functionality to regulate triggers, kept systems, and UDFs"

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This is known as table pivoting and can be produced using the following SQL statement using the CASE 54 Part I: SQL TOOLS, TIPS, AND TRICKS Part I: SQL TOOLS, TIPS, AND TRICKS 55 expression in the SELECT-list: SELECT SALES_MGR, MAX(CASE MONTH WHEN 1 THEN SALES_AMT ELSE NULL END) AS JAN, MAX(CASE MONTH WHEN 2 THEN SALES_AMT ELSE NULL END) AS FEB, MAX(CASE MONTH WHEN 3 THEN SALES_AMT ELSE NULL END) AS MAR, MAX(CASE MONTH WHEN 4 THEN SALES_AMT ELSE NULL END) AS APR, MAX(CASE MONTH WHEN 5 THEN SALES_AMT ELSE NULL END) AS MAY, MAX(CASE MONTH WHEN 6 THEN SALES_AMT ELSE NULL END) AS JUN, MAX(CASE MONTH WHEN 7 THEN SALES_AMT ELSE NULL END) AS JUL, MAX(CASE MONTH WHEN 8 THEN SALES_AMT ELSE NULL END) AS AUG, MAX(CASE MONTH WHEN 9 THEN SALES_AMT ELSE NULL END) AS SEP, MAX(CASE MONTH WHEN 10 THEN SALES_AMT ELSE NULL END) AS OCT, MAX(CASE MONTH WHEN 11 THEN SALES_AMT ELSE NULL END) AS NOV, MAX(CASE MONTH WHEN 12 THEN SALES_AMT ELSE NULL END) AS DEC FROM SALES WHERE YEAR = ?

A specialized form of subquery, called a correlated subquery, provides a further level of flexibility by permitting the nested SELECT statement to refer back to columns in previous SELECT statements. EMPNO; Look closely at this correlated subquery. It differs from a normal subquery in that the nested SELECT statement refers back to the table in the first SELECT statement. The preceding query returns information for all employees who earn a SALARY greater than the average salary for that employee's given department.

Contrast this with the looser, comma-delimited formulation. It is much easier to determine which predicate applies to which join specification when the INNER JOIN syntax is used. To determine the magnitude of the join in this example, count the JOIN keywords and add 1. There are two JOIN keywords specified, so the magnitude of the join is 2+1, or 3. Tables can be joined to themselves also. DEPTNO; This join returns a listing of all department numbers and names, along with the associated department number and name to which the department reports.

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