I've been running this query for quite some time that basically says: SELECT (A + B + C) - (X + Y + Z) AS Variance FROM ..... Up until now, this has been working correctly and showing up as anything from -100 to +100. Now all of a sudden, it's showing up as 18446744073709551613 instead of -1, 18446744073709551614 instead of -2, etc. Now, A, B, C, X, Y & Z are all defined as "UNSIGNED" in the database table. But again, this WAS working as of MySQL 3.23, and we've been running it for well over a year. Now, on version 4.x, I started getting the big numbers. I can only assume that there is some sort of precedence thing that changed. Can anyone shed some light on this? Or maybe tell me what I need to do differently to make this work now? Thanks, Mark
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