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Re: Re: How to get a placeholder to keep the current column value?

by giulienk (Curate)
on Oct 27, 2003 at 08:07 UTC ( #302354=note: print w/replies, xml ) Need Help??


in reply to Re: How to get a placeholder to keep the current column value?
in thread How to get a placeholder to keep the current column value?

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.


$|=$_="1g2i1u1l2i4e2n0k",map{print"\7",chop;select$,,$,,$,,$_/7}m{..}g

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