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It seems that MySQL's COALESCE allows to input NULL values as if all the values are NULL, NULL will be returned.
I quote from MySQL Manual: COALESCE(list) Returns first non-NULL element in list: mysql> SELECT COALESCE(NULL,1); -> 1 mysql> SELECT COALESCE(NULL,NULL,NULL); -> NULL UPDATE: ops, i wasn't careful enough to check the solution offered. In that case NULL won't be returned so Jenda's assumption is right.
In reply to Re: Re: How to get a placeholder to keep the current column value?
by giulienk
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