By Kalen Delaney
In complex Transact-SQL for SQL Server 2000, authors Itzik Ben-Gan and Thomas Moreau discover the robust functions of Transact-SQL (T-SQL). Ben-Gan and Moreau provide suggestions to universal difficulties encountered utilizing all models of SQL Server, with a spotlight at the newest model, SQL Server 2000.Expert guidance and genuine code examples train complex database programmers to write down extra effective and better-performing code that takes complete benefit of T-SQL. The authors provide functional suggestions to the standard difficulties programmers face and contain in-depth info on complex T-SQL issues resembling joins, subqueries, kept strategies, triggers, user-defined services (UDFs), listed perspectives, cascading activities, federated perspectives, hierarchical constructions, cursors, and extra.
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In complicated Transact-SQL for SQL Server 2000, authors Itzik Ben-Gan and Thomas Moreau discover the strong functions of Transact-SQL (T-SQL). Ben-Gan and Moreau provide ideas to universal difficulties encountered utilizing all types of SQL Server, with a spotlight at the newest model, SQL Server 2000. professional tips and genuine code examples train complex database programmers to put in writing extra effective and better-performing code that takes complete benefit of T-SQL.
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Also notice that in the output shown in Table 1−4, some of the information from the tables is missing. The name Jeffrey does not appear in the output, nor does the Sanitation department. The reason for this is that inner joins return only matching rows from both tables. Since this company doesn't care too much about sanitation, they have no employees in that department. Jeffrey's disappearance is a bit more complicated. Jeffrey doesn't belong to any specific department, so he has NULL in the deptno column.
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. 00 Chapter 2: Subqueries and Derived Tables SUBQUERIES ARE SPECIAL CASES of queries within queries. They eliminate the need to save data in temporary tables or variables so that it can be used in subsequent queries later in your code.
Check out the solution in Listing 2−10. ProductID ) You can also use a derived table to solve this type of problem, as you will see later in this chapter. Using the EXISTS Predicate The EXISTS predicate is a great feature of SQL. It is probably the most powerful version of a correlated subquery, yet it is under−used in the industry. It allows you to return a row if a given condition exists. You don't have to read a bunch of rows that satisfy the conditionone is all you need. The following example will demonstrate the syntax.