By Itzik Ben-Gan
This e-book explores the robust functions of T-SQL and enables you to make the most them to the max. The publication tackles complicated components in T-SQL equivalent to joins, subqueries, shops strategies, triggers, user-defined capabilities, listed perspectives, cascading activities, federated perspectives, hierarchial constructions and extra. The ebook exhibits options to universal difficulties either in SQL server 2000 and in past models. specified emphasis is put on practicular difficulties within the and on writing effective and good appearing code. The ebook doesn't cease at ANSI-92 SQL but in addition represents positive aspects which are specific to SQL Server, in particular SQL Server 2000. that can assist you on your trip, the ebook offers many puzzles (and watch out, those usually are not basic 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 well-liked 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 adventure in info know-how. Moreau has been utilizing SQL Server on account that 1993. He writes frequently for Pinnacle's Microsoft SQL Server specialist publication.
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Additional resources for Advanced Transact-SQL for SQL Server 2000
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.
Productid WHERE SupplierID = 1 Note that you can use either the full table name or the table qualifier to specify the table you are modifying. You are not limited to using inner joins to modify data. You can use outer joins as well. Chapters 14 and 16 deal with much more sophisticated updates and deletes using joins. 44 Performance Considerations This section describes using hints to specify a certain join strategy and provides a few guidelines to help you achieve better performance with your join queries.
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. Let Result = Input1 LEFT OUTER JOIN Input2. Since there are no rows in the second input, all the values that were supposed to come from it are replaced with NULLs, as the output in Table 1−17 shows.