From: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
---|---|
To: | David Frankson <David(dot)Frankson(at)infinitecampus(dot)com> |
Cc: | "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: Extending COALESCE() |
Date: | 2010-11-23 05:06:57 |
Message-ID: | AANLkTinBOWypD=XMvjmeKHYfc4yZ=Z+vc-pm=kWrCM0C@mail.gmail.com |
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Thread: | |
Lists: | pgsql-general |
Hello
I am afraid, so this isn't possible. You have to use a explicit cast
"int to bool"
select coalesce(true, 0::bool)
regards
Pavel Stehule
2010/11/23 David Frankson <David(dot)Frankson(at)infinitecampus(dot)com>:
> Is it possible to extend the COALESCE() function? I would like to support
> for coalescing an int into a Boolean, but I get syntax errors if I don’t
> wrap coalesce in quotes.
>
>
>
> CREATE OR REPLACE FUNCTION coalesce(boolean,int) RETURNS boolean AS $$
>
>
>
> SELECT CASE WHEN $1 IS NOT NULL THEN $1 WHEN $2 = 1 THEN
> true ELSE false END
>
>
>
> $$ LANGUAGE sql IMMUTABLE;
>
>
>
>
>
> Thanks,
>
>
>
> Dave
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