Beginner's SQL: Aggregates and Grouping Support

When you create a database-driven Web site, you will encounter a number of common data retrieval scenarios. Simple lists, header/detail listings, row difference calculations, and reports with subtotals can all be satisfied using fairly basic SELECT queries. But when you move on to functions that aggregate data - to find sums, averages, counts and the like, there's a few gotchas that can baffle the newbie and trip up even the experienced developer.

Wave goodbye to Aggregate and groupings gotcha misery with Rudy's easy-to-follow tutorial on some of SQL's powerful aggregating functions!

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Rudy Limeback

Rudy LimebackRudy Limeback is an independent consultant with over 20 years of SQL experience using DB2, SQL Server, Access, Oracle, and MySQL. Rudy is also a Web developer, Technical Editor at Digital Web, one of the original evolt.org admins, with his own Web site since 1996. More information at r937.com. Rudy lives in Toronto, Canada, where the weather allows you to play frisbee golf all year long.

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