By Itzik Ben-Gan
This e-book explores the robust functions of T-SQL and allows you to make the most them to the max. The booklet tackles complicated parts in T-SQL resembling joins, subqueries, shops tactics, triggers, user-defined capabilities, listed perspectives, cascading activities, federated perspectives, hierarchial buildings and extra. The e-book exhibits recommendations to universal difficulties either in SQL server 2000 and in past types. exact 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 in addition represents gains 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 are usually not 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 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 know-how. Moreau has been utilizing SQL Server in view that 1993. He writes on a regular basis for Pinnacle's Microsoft SQL Server specialist e-newsletter.
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Additional resources for Advanced Transact-SQL for SQL Server 2000
00 35 Step 2. Let Input2 = all rows from Departments. The output of Step 2 is shown in Table 1−20. Table 1−20: Output of Step 2 in an SQL−92 Query Looking for Mismatches deptno 100 200 300 400 deptname Engineering Production Sanitation Management Step 3. Let Input3 = Input1 LEFT OUTER JOIN Input2. The output of Step 3 is shown in Table 1−21. 00 Step 4. Let Result = filter Input3WHERE empid IS NULL. The output of Step 4 is shown in Table 1−22. Table 1−22: Output of Step 4 in an SQL−92 Query Looking for Mismatches deptno deptname empid empname deptno jobid salary 300 Sanitation NULL NULL NULL NULL NULL The nice thing about the SQL−92 syntax is that you can request a different order of execution by including the filter in the join condition, as shown in Listing 1−29.
This section describes how to deal with these situations. The Dating Service Scenario Consider the Candidates table in Listing 1−30, which holds candidate information for a dating service. Listing 1−30: Schema Creation Script for the Candidates Table CREATE TABLE Candidates ( candname varchar(10) NOT NULL, gender char(1) NOT NULL CONSTRAINT CHK_gender CHECK (gender IN('F', 'M')) ) INSERT INTO Candidates VALUES('Neil' , 'M') INSERT INTO Candidates VALUES('Trevor' , 'M') INSERT INTO Candidates VALUES('Terresa', 'F') INSERT INTO Candidates VALUES('Mary' , 'F') The content of the Candidates table is shown in Table 1−24.
Advantage 12 With the SQL−92 syntax, you can control the order of the query execution, whereas with the old−style syntax you can't. Self and Non−Equal Joins Most of the time when you write joins, the queries involve at least two different tables and the join condition is an equal sign where you look for exact matches between the rows in the participating tables. There are some situations, though, where you need to join a table to itself (self−join). There are also situations where the relationship between the rows in the participating tables is not based on exact matches; rather, it's based on another logical condition (non−equal join).