By Itzik Ben-Gan
This booklet explores the strong features of T-SQL and enables you to take advantage of them to the max. The booklet tackles complex parts in T-SQL corresponding to joins, subqueries, shops techniques, triggers, user-defined capabilities, listed perspectives, cascading activities, federated perspectives, hierarchial buildings and extra. The booklet exhibits ideas to universal difficulties either in SQL server 2000 and in earlier types. detailed emphasis is put on practicular difficulties within the and on writing effective and good acting code. The e-book doesn't cease at ANSI-92 SQL but in addition represents good points which are specific to SQL Server, specially SQL Server 2000. that will help you on your trip, the ebook presents many puzzles (and watch out, those aren't 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 favored 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 event in details expertise. Moreau has been utilizing SQL Server considering that 1993. He writes frequently for Pinnacle's Microsoft SQL Server specialist e-newsletter.
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For example, try to write the previous query in the old−style syntax. An illegal attempt is shown in Listing 1−21. jobid This query will produce an error, indicating that the query contains an outer join request that is not permitted. 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.
Separate tables that participate in joins onto different disks by using filegroups to exploit parallel disk I/O. References to additional information about joins, query performance, join internals, and indexes can be found in Appendix G. SQL Puzzle 1−1: Joins This first puzzle involves the human resources database presented in this chapter. 00. 00 belonging to them or not. The output should look like this: deptno deptname empid empname deptno jobid 300 Sanitation NULL NULL NULL NULL 400 Management 1 Leo 400 30 400 Management 4 Rob 400 30 400 Management 5 Laura 400 30 The answer to this puzzle can be found on pages 671673.
00) Take a look at the Human Resources database schema shown in Figure 1−1 for a graphical view of the tables and the relationships between them. Figure 1−1: Human Resources database schema Tables 1−1 through 1−3 delineate the contents of the Departments, Jobs, and Employees tables, respectively. As you read through this chapter, you may find it useful to refer back to these tables. 00 Inner Joins Instead of jumping right in and writing your first inner−join query, first take a look at the different elements of an abbreviated form of the SELECT statement syntax, as shown in Listing 1−2.