By Kalen Delaney
In complex Transact-SQL for SQL Server 2000, authors Itzik Ben-Gan and Thomas Moreau discover the robust features of Transact-SQL (T-SQL). Ben-Gan and Moreau provide options to universal difficulties encountered utilizing all types of SQL Server, with a spotlight at the newest model, SQL Server 2000.Expert guidance and genuine code examples train complex database programmers to write down extra effective and better-performing code that takes complete benefit of T-SQL. The authors supply useful strategies to the typical difficulties programmers face and contain in-depth info on complex T-SQL subject matters similar to joins, subqueries, saved tactics, triggers, user-defined capabilities (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
You could rewrite the three−way SQL−92 join query so that you first join Employees to Jobs and then join it to Departments, but the output would be the same. The query processor is aware of that and will decide on the internal order in which it accesses the tables based on cost estimation, and it will come up with the same execution plan regardless of the order of the tables in the query. With other types of joins, the order of the tables in the query might produce different results, and therefore might require a different execution plan.
You don't need an additional condition, because checking for unequal genders will also take care of the previous problem, so you write the query shown in Listing 1−33. gender The output of this query is shown in Table 1−27. Table 1−27: Output of Matching Couples Using a Cross Join; Couples with Different Genders candname Terresa Mary Terresa Mary Neil Trevor Neil Trevor candname Neil Neil Trevor Trevor Terresa Terresa Mary Mary The only problem that you are left with is that you send each couple twice to the restaurant.
The first occurrence (after the first FROM clause) specifies which table is modified, and the second occurrence (after the second FROM clause) is used for the join operation. This syntax doesn't allow you to specify more than one table after the first FROM clause. If it did, it wouldn't be possible to determine which table is modified. You can also use the table qualifier after the first DELETE clause to specify the table you are deleting from (for example, DELETE FROM OD). Using Joins to Update Data The UPDATE statement has a similar syntax to the DELETE statement, as shown in Listing 1−41.
Advanced Transact−SQL for SQL Server 2000 by Kalen Delaney