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 NULL
THEN ...
ELSIF foo
THEN ...
ELSE ...
END IF;
Michael Glaesemann grzm myrealbox com
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