2011/2/22 Joerg Bruehe <joerg.bruehe@stripped>:
> You have not understood the concept of NULL in SQL:
> NULL does not mean "empty", it means "unknown".
Apart form fully agreeing with Joerg, just a tip:
you can use the the IFNULL() operand as a workaround:
Anyway, you should get rid of misplaced NULL fields, as they also
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