By Itzik Ben-Gan
This e-book explores the strong features of T-SQL and enables you to make the most them to the max. The publication tackles complicated components in T-SQL resembling joins, subqueries, shops techniques, triggers, user-defined services, listed perspectives, cascading activities, federated perspectives, hierarchial buildings and extra. The publication indicates options to universal difficulties either in SQL server 2000 and in prior models. particular emphasis is put on practicular difficulties within the and on writing effective and good appearing code. The publication 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 e-book offers many puzzles (and pay attention, those will not be 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 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 adventure in details expertise. Moreau has been utilizing SQL Server because 1993. He writes usually for Pinnacle's Microsoft SQL Server specialist publication.
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Salary BETWEEN lowbound AND highbound The output of this query is shown in Table 1−31. 00 sallevel Doing most of the work Planning the work Tell subordinates what to do Tell subordinates what to do Owners and their relatives Owners and their relatives 42 More complex examples of non−equal joins are discussed in Chapter 16. Using Joins to Modify Data Sometimes you need to modify data but the criteria that define which rows need to be affected is based on data that doesn't exist in the modified table.
First, the IN predicate can be written as a bunch of OR x = y clauses, while the NOT applies to the entire IN predicate, which can be massaged into AND x <> y clauses. Here's the rubif any y is NULL, then the entire predicate is FALSE, because x <> NULL is FALSE. 50 Tip Be sure to filter out NULLs inside the inner query when using NOT IN. Take advantage of the ISNULL() and COALESCE() functions. ) Using Correlated Subqueries A correlated subquery is one where the "inner" SELECT is dependent upon a value from the "outer" SELECT.
For example, suppose you've been asked to determine the number of transactions attributed to customers in the United Kingdom. , and then you use the IN predicate and count the number of matches. , you cannot assemble a list of all UK customers and hard−code it into the IN predicate. That's why you need a subquery. Country = 'UK' The queries in Listings 2−4 and 2−5 have exactly the same performance in SQL Server because the optimizer generates the same query plan for each. The opposite of IN is NOT IN.