On Jun 24, 2004, at 2:12 AM, Josh Berkus wrote:
> Sad,
>
>> since BOOL expression has three possible values: TRUE,FALSE,NULL
>> plpgsql IF control structure should have three alternate blocks:
>> THEN,ELSE,NULL
>>
>> shouldn't it ?
>
> No, why?
>
> How would you construct a tri-valued IF/THEN? Doesn't seem too
> likely to
> me, as well as being different from every other programming language in
> existance ...
Creating a new control structure to do handle this seems odd. However,
one could easily have the same effect using a nested if. Using the
pl/pgsql ELSIF construct, it's pretty straightforward.
IF foo IS NULLTHEN ...
ELSIF fooTHEN ...
ELSE ...
END IF;
Michael Glaesemann
grzm myrealbox com
