| From: | Radu-Adrian Popescu <radu(dot)popescu(at)aldratech(dot)com> | 
|---|---|
| To: | pgsql-sql(at)postgresql(dot)org | 
| Cc: | sad(at)bankir(dot)ru | 
| Subject: | Re: feature request ? | 
| Date: | 2004-06-24 18:24:57 | 
| Message-ID: | 40DB1C79.1000307@aldratech.com | 
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| Lists: | pgsql-sql | 
Bruno Wolff III wrote:
> 
> There already is a syntax like this. You can do:
> CASE boolean_expression
>   WHEN TRUE THEN whatever
>   WHEN FALSE THEN whatever
>   ELSE whatever
> END
> 
Besides, sad, there's no such thing as a tri-valued boolean.
You either have a boolean(with a true/false value) or a NULL, which is something 
completely different and it's _not_ one of the two _values_ that a boolean 
object takes. I think you're looking at this completely wrong. If in Java you 
receive a Boolean object instance, will you start claiming that that Java has 
tri-valued booleans, and the "if" should account for that ?!
You can think of values in plpgsql as wrapper objects that carry a value and 
have a "is_null" flag; I have no idea how they're implemented in PostgreSQL or 
in any RDMBS in general but this should do it, at least for a naive implementation.
Peace,
-- 
Radu-Adrian Popescu
CSA, DBA, Developer
Aldrapay MD
Aldratech Ltd.
+40213212243
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