By Kalen Delaney
In complicated Transact-SQL for SQL Server 2000, authors Itzik Ben-Gan and Thomas Moreau discover the strong services of Transact-SQL (T-SQL). Ben-Gan and Moreau provide strategies to universal difficulties encountered utilizing all types of SQL Server, with a spotlight at the newest model, SQL Server 2000.Expert suggestions and genuine code examples educate complex database programmers to write down extra effective and better-performing code that takes complete benefit of T-SQL. The authors supply functional suggestions to the typical difficulties programmers face and comprise in-depth details on complex T-SQL subject matters similar to joins, subqueries, kept approaches, triggers, user-defined capabilities (UDFs), listed perspectives, cascading activities, federated perspectives, hierarchical buildings, cursors, and extra.
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Extra resources for Advanced Transact−SQL for SQL Server 2000
37 Table 1−24: Data from the Candidates Table candname Neil Trevor Terresa Mary gender M M F F You need to match all possible couples, and for this example, the request is to match males with females. The list will be used to send each couple to a restaurant so they can get to know each other. After all possible couples have dated, each person decides who fits him or her the most, if at all, and if this matches the other's choice, then a match is made. But this is really not your problemyou only need to provide the initial list.
If you want to supply employee, department, and job information for matching employees and departments, preserving all jobs, you can write the query in Listing 1−22 using the SQL−92 syntax. jobid The output of this query is shown in Table 1−12. 00 NULL deptno 100 200 400 400 400 NULL deptname Engineering Production Management Management Management NULL jobid 10 20 30 30 30 40 jobdesc Engineer Worker Manager Manager Manager Cleaner But you're out of luck again with the old−style syntax shown in Listing 1−23.
Jobid If you try to run this query, you will get an error indicating that the Employees table is an inner member of an outer−join clause, and that this is not allowed if the table also participates in a regular join clause. This brings us to the fourth advantage of the SQL−92 syntax. Advantage 11 Not all SQL−92 outer joins that join more than two tables can be written in the old−style syntax. The Catch Now comes the catchsuppose you want to produce department and employee information, preserving all departments, and using the old style, as in Listing 1−24.
Advanced Transact−SQL for SQL Server 2000 by Kalen Delaney