Hello.
That seems like a bug:
http://bugs.mysql.com/bug.php?id=14543
Marko Domanovic wrote:
> mysql 5.0.15-standard
> UPDATE <table> SET <fieldname> = <fieldname>-1
> when the <fieldname> is 0 gives me 4294967295
> <fieldname> is integer(10) unsigned...
>
> maybe it would be more logical the expression to evaluate as 0, insted 2^32
> ..
>
>
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