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Download e-book for kindle: Advanced Transact-SQL for SQL Server 2000 by Itzik Ben-Gan

By Itzik Ben-Gan

ISBN-10: 1893115828

ISBN-13: 9781893115828

This publication explores the strong functions of T-SQL and enables you to take advantage of them to the max. The booklet tackles complicated parts in T-SQL comparable to joins, subqueries, shops systems, triggers, user-defined services, listed perspectives, cascading activities, federated perspectives, hierarchial constructions and extra. The booklet indicates recommendations to universal difficulties either in SQL server 2000 and in earlier types. designated emphasis is put on practicular difficulties within the and on writing effective and good appearing code. The ebook doesn't cease at ANSI-92 SQL but in addition represents gains which are specific to SQL Server, in particular SQL Server 2000. that will help you on your trip, the e-book offers many puzzles (and pay attention, those should not easy ones) and proposed solutions.About the authors:Itzik Ben-Gan is a senior SQL Server teacher and advisor with ten years of expertise in networking, improvement, databases and information warehousing. he's a well-liked columnist and contributing editor for SQL Server journal, and is a Microsoft SQL Server MVP.Dr. Tom Moreau is President of Brockman Moreau Consulting, Inc. with greater than 16 years adventure in info know-how. Moreau has been utilizing SQL Server on the grounds that 1993. He writes on a regular basis for Pinnacle's Microsoft SQL Server specialist publication.

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Here's the rubif any y is NULL, then the entire predicate is FALSE, because x <> NULL is FALSE. 50 Tip Be sure to filter out NULLs inside the inner query when using NOT IN. Take advantage of the ISNULL() and COALESCE() functions. ) Using Correlated Subqueries A correlated subquery is one where the "inner" SELECT is dependent upon a value from the "outer" SELECT. You've already seen a nested subquery, but there was nothing inside the inner query that linked it to the outer query. To turn this into a correlated subquery, you can add criteria to the WHERE clause of the inner query.

Table 1−16: Output of Step 2 in an Old−Style Query Looking for Mismatches deptno deptname (Empty set) Step 3. Let Result = Input1 LEFT OUTER JOIN Input2. Since there are no rows in the second input, all the values that were supposed to come from it are replaced with NULLs, as the output in Table 1−17 shows. Table 1−17: Output of Step 3 in an Old−Style Query Looking for Mismatches deptno 100 200 300 400 deptname Engineering Production Sanitation Management empid NULL NULL NULL NULL empname NULL NULL NULL NULL deptno NULL NULL NULL NULL jobid NULL NULL NULL NULL salary NULL NULL NULL NULL Controlling the Order of Join Processing With the SQL−92 syntax, you can control the order of the query execution phases.

Let Input1 = all rows from Employees. The output of Step 1 is shown in Table 1−19. 00 35 Step 2. Let Input2 = all rows from Departments. The output of Step 2 is shown in Table 1−20. Table 1−20: Output of Step 2 in an SQL−92 Query Looking for Mismatches deptno 100 200 300 400 deptname Engineering Production Sanitation Management Step 3. Let Input3 = Input1 LEFT OUTER JOIN Input2. The output of Step 3 is shown in Table 1−21. 00 Step 4. Let Result = filter Input3WHERE empid IS NULL. The output of Step 4 is shown in Table 1−22.

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Advanced Transact-SQL for SQL Server 2000 by Itzik Ben-Gan

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