By Itzik Ben-Gan
This ebook explores the strong features of T-SQL and allows you to take advantage of them to the max. The booklet tackles complex parts in T-SQL similar to joins, subqueries, shops tactics, triggers, user-defined services, listed perspectives, cascading activities, federated perspectives, hierarchial buildings and extra. The ebook indicates suggestions to universal difficulties either in SQL server 2000 and in past types. specific emphasis is put on practicular difficulties within the and on writing effective and good acting code. The publication doesn't cease at ANSI-92 SQL but in addition represents beneficial properties which are specific to SQL Server, in particular SQL Server 2000. that will help you on your trip, the booklet offers many puzzles (and pay attention, those should not uncomplicated 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 knowledge 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 event in details expertise. Moreau has been utilizing SQL Server seeing that 1993. He writes frequently for Pinnacle's Microsoft SQL Server expert publication.
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Additional info for Advanced Transact-SQL for SQL Server 2000
It is more common, though, to find old−style code that was written a long time ago, and which no one bothered to migrate to SQL−92 syntax. As you go along and examine the different aspects of joins, you will also learn about the difference between the syntaxes, and hopefully, you will be convinced that it is better practice to migrate to the newer SQL−92 syntax. The advantages of using the SQL−92 syntax will be enumerated. The Latex Manufacturing Company Example In this chapter, you will be presented with many code samples, and most of them will be run against a Human Resources database of an imaginary latex manufacturing company.
Indexes improve the performance of SELECT queries but degrade the performance of modifications. • 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.
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. Completely Qualified Filter Criteria SQL Server's optimizer is a very smart component, but sometimes it needs a little help. It might seem obvious to you that if A = B and B = C, then A = C, but it is not always obvious to the optimizer.
Advanced Transact-SQL for SQL Server 2000 by Itzik Ben-Gan