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A great visual explanation of SQL joins on Coding Horror, a...

Note: This article was originally published at Planet PHP on 7 January 2011.
Planet PHP

A great visual explanation of SQL joins on Coding Horror, a rewrite of Lig's awesome post: aoGettinga Joins

Before you think about sending an email aohey, can you optimize my querya, please read this article and make sure you're using your joins as expected.

Also, yay Venn diagrams!