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 booklet tackles complex components in T-SQL equivalent to joins, subqueries, shops approaches, triggers, user-defined features, listed perspectives, cascading activities, federated perspectives, hierarchial constructions and extra. The publication exhibits recommendations to universal difficulties either in SQL server 2000 and in prior types. distinct emphasis is put on practicular difficulties within the and on writing effective and good acting code. The e-book doesn't cease at ANSI-92 SQL but additionally represents good points which are specific to SQL Server, particularly SQL Server 2000. that will help you on your trip, the booklet presents many puzzles (and watch out, those usually are 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 favored 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 know-how. Moreau has been utilizing SQL Server for the reason that 1993. He writes frequently for Pinnacle's Microsoft SQL Server specialist e-newsletter.
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Extra resources for Advanced Transact-SQL for SQL Server 2000
Breaking this down into two parts, you first have to determine when the last order was placed, and then you have to compare the order date of each order to this date. The first of these queries is shown in Listing 2−1. Listing 2−1: Finding the Date of the Last Order SELECT MAX (OrderDate) FROM Orders You now have the date of the last order, so you can compare the order dates in the table to this value. For this to work, you need to put the first query in parentheses. The final query is presented in Listing 2−2.
Your first impulse might be to create a temporary table of average orders for each product and then join onto the Order Details table for the final result. However, this query can actually be done as a single SELECT with the subquery being in the HAVING predicate. 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.
37 Table 1−24: Data from the Candidates Table candname Neil Trevor Terresa Mary gender M M F F You need to match all possible couples, and for this example, the request is to match males with females. The list will be used to send each couple to a restaurant so they can get to know each other. After all possible couples have dated, each person decides who fits him or her the most, if at all, and if this matches the other's choice, then a match is made. But this is really not your problemyou only need to provide the initial list.
Advanced Transact-SQL for SQL Server 2000 by Itzik Ben-Gan