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I run 4.x because I have a few scripts that are a little "loose" on how they handle NULL value inserts. 5.x has a strict mode by default that doesn?t allow NULL inserts. I think there's a my.ini flag to make 5.x backwards compatible and has a negligible performance impact.... I guess I'm just lazy to do an upgrade in place. My new projects where I am writing the code from ground up will use 5.x since it now handles stored procedures, views, and triggers.
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