By Kalen Delaney
In complex Transact-SQL for SQL Server 2000, authors Itzik Ben-Gan and Thomas Moreau discover the strong features of Transact-SQL (T-SQL). Ben-Gan and Moreau provide options to universal difficulties encountered utilizing all models of SQL Server, with a spotlight at the most recent model, SQL Server 2000.Expert suggestions and actual code examples educate complex database programmers to put in writing extra effective and better-performing code that takes complete benefit of T-SQL. The authors provide sensible strategies to the typical difficulties programmers face and comprise in-depth details on complicated T-SQL issues corresponding to joins, subqueries, kept techniques, triggers, user-defined services (UDFs), listed perspectives, cascading activities, federated perspectives, hierarchical constructions, cursors, and extra.
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Extra info for Advanced Transact−SQL for SQL Server 2000
Listing 1−26 shows the textual SHOWPLAN output for the same query. deptno IS NULL, is applied prior to the join operation. To understand what is going on here, examine this plan step by step. 33 Step 1. Let Input1 = all rows from Employees. The output of Step 1 is shown in Table 1−15. 00 Step 2. Let Input2 = all rows from Departments WHERE deptno IS NULL. The output of Step 2 is shown in Table 1−16. Table 1−16: Output of Step 2 in an Old−Style Query Looking for Mismatches deptno deptname (Empty set) Step 3.
Table 'Orders'. Scan count 1, logical reads 3, physical reads 0, read−ahead reads 0. Listing 1−45 shows the SHOWPLAN output. [OrderID]) ORDERED FORWARD) You can revise this query so that it uses a completely qualified filter criteria, as shown in Listing 1−46. OrderID >= 11000 Listing 1−47 shows the output of STATISTICS IO for this new version of the query. Listing 1−47: I/O Measures for a Query with a Completely Qualified Filter Criteria Table 'Order Details'. Scan count 1, logical reads 3, physical reads 0, read−ahead reads 0.
It explores both the functionality and performance aspects of each of these joins. And Then There Were Two T−SQL supports two join syntaxes. 5 is referred to as the SQL−92 syntax because it is ANSI SQL−92 compliant. Both syntaxes are still supported in SQL Server 2000, and you can still find programmers writing new code using the old−style syntax. It is more common, though, to find old−style code that was written a long time ago, and which no one bothered to migrate to SQL−92 syntax. As you go along and examine the different aspects of joins, you will also learn about the difference between the syntaxes, and hopefully, you will be convinced that it is better practice to migrate to the newer SQL−92 syntax.
Advanced Transact−SQL for SQL Server 2000 by Kalen Delaney