Read e-book online Advanced Transact−SQL for SQL Server 2000 PDF

By Kalen Delaney

ISBN-10: 0735609985

ISBN-13: 9780735609983

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 supply options to universal difficulties encountered utilizing all types of SQL Server, with a spotlight at the most modern model, SQL Server 2000.Expert suggestions and actual code examples train complex database programmers to put in writing extra effective and better-performing code that takes complete benefit of T-SQL. The authors supply useful strategies to the standard difficulties programmers face and contain in-depth info on complex T-SQL issues reminiscent of joins, subqueries, kept methods, triggers, user-defined features (UDFs), listed perspectives, cascading activities, federated perspectives, hierarchical constructions, cursors, and extra.

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But before delving into the differences, a few more issues need to be covered. Old−Style Two−Way Right Outer Joins If you want to preserve all rows from the Departments table, you can simply write a right outer join query. Listing 1−17 shows how to achieve this using the old−style syntax. deptno The output of this query is shown in Table 1−8. 00 deptno 100 200 300 400 400 400 deptname Engineering Production Sanitation Management Management Management Jeffrey disappeared again because his row is now in the unpreserved table and it doesn't have a match in the Departments table.

Listing 1−15: SQL−92 Two−Way Outer Join Syntax SELECT FROM T1 {LEFT | RIGHT | FULL} [OUTER] JOIN T2 ON [WHERE Note that specifying the outer join type is mandatory, but specifying the key− word OUTER is optional. SQL−92 Two−Way Left Outer Joins You can write a query similar to the previous query in the SQL−92 syntax, as Listing 1−16 shows. deptno The output looks the same as the output of Listing 1−14, but as mentioned earlier in the chapter, they are processed differently and might produce different results.

The Sanitation department, however, still doesn't appear in the output because its row is in the unpreserved table. Don't get confused with the NULLs in Jeffrey's details. The first NULL in the first deptno column in the output is the original NULL that appears in his row in the Employees table. The other two NULLs replace the values that were supposed to come from the Departments table, where there was no match to Jeffrey's row. SQL−92 Two−Way Outer Joins The SQL−92 syntax for an outer join between two tables is shown in Listing 1−15.

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Advanced Transact−SQL for SQL Server 2000 by Kalen Delaney

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