By Itzik Ben-Gan
This ebook explores the strong features of T-SQL and enables you to make the most them to the max. The ebook tackles complicated parts in T-SQL similar to joins, subqueries, shops techniques, triggers, user-defined capabilities, listed perspectives, cascading activities, federated perspectives, hierarchial constructions and extra. The e-book indicates options to universal difficulties either in SQL server 2000 and in prior types. distinctive emphasis is put on practicular difficulties within the and on writing effective and good appearing code. The booklet doesn't cease at ANSI-92 SQL but additionally represents gains which are specific to SQL Server, specially SQL Server 2000. that will help you on your trip, the booklet offers many puzzles (and pay attention, those are usually 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 event in info expertise. Moreau has been utilizing SQL Server because 1993. He writes on a regular basis for Pinnacle's Microsoft SQL Server expert publication.
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Extra resources for Advanced Transact-SQL for SQL Server 2000
Outer Joins Outer joins enable you to define either one or both of the tables participating in the join as preserved tables. This means that besides returning matching rows from both tables, the rows from the preserved table that have no match in the other table are also returned, padded with NULLs instead of the values that were supposed to come from the other table. In the case of outer joins, the old−style syntax is not ANSI compliant. In fact, SQL−89 did not support outer joins, so other vendors also came up with their own syntax, which gives us another advantage of the SQL−92 syntax.
They also provide you with an alternative to joins (described in Chapter 1) for obtaining the same result set. Indeed, many subqueries can be reduced to an equivalent join, as this chapter explains. The chapter also describes situations where a join won't do and you have to go with a subquery. Derived tables are special subqueries that look and feel like tables. 5. Without derived tables, you are often forced to use temporary tables, which can adversely affect your query's performance. This chapter will unlock the secrets behind derived tables and show you how to streamline your code.
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. Listing 1−15: SQL−92 Two−Way Outer Join Syntax SELECT
Advanced Transact-SQL for SQL Server 2000 by Itzik Ben-Gan