The Db2 Portal Blog

News, views, and items of interest on IBM's Db2 database management system and mainframes.

Showing posts with label UNION. Show all posts
Showing posts with label UNION. Show all posts
Tuesday, November 17, 2009

Replacing UNION with CASE

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When a UNION is required to put together data from multiple queries, you might be able to use a CASE statement instead. This is very useful,...
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Craig S. Mullins
Sugar Land, Texas, United States
Craig S. Mullins is a data management strategist, researcher, and consultant. He is president and principal consultant of Mullins Consulting, Inc. and the publisher/editor for The Database Site.

Craig has been named by IBM as a Gold Consultant and an IBM Champion for Analytics. He has been named as one of the Top 200 Thought Leaders in Big Data and Analytics by AnalyticsWeek magazine.

Craig has over three decades of experience in all facets of database systems development and has worked with Db2 since V1. You may know Craig from his popular books: Db2 Developer's Guide (covering IBM's mainframe RDBMS)... A Guide to Db2 Performance for Application Developers (how to write efficient Db2 programs) and... Database Administration: The Complete Guide to DBA Practices and Procedures (a guide to heterogenous DBA).
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