Re: feature request ?

Programming languages, perhaps, but clearly not uncommon in SQL ... Informix certainly allows a column to be of type boolean but with a value of NULL for given rows (unless precluded by a not-null constraint). Should we question integers, which can be positive, negative, or -- gasp ! -- NULL ?

I don't see what your point is. That SQL is wrong ? Or that SQL is not "C" ? Or that SQL is not a "programming language" ?

"?Que purposa sirve tanto comedia ? Quien inventan tab miseria ?"

Greg Williamson
DBA
GLobeXplorer LLC

-----Original Message-----
From: sad [mailto:sad(at)bankir(dot)ru]
Sent: Wed 6/23/2004 10:01 PM
To: pgsql-sql(at)postgresql(dot)org
Cc:
Subject: Re: [SQL] feature request ?
On Wednesday 23 June 2004 21:12, you 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 ...

Three valued BOOLEAN is already different "from every other programming
language in existance"

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