From: | jwieck(at)debis(dot)com (Jan Wieck) |
---|---|
To: | sferac(at)bo(dot)nettuno(dot)it |
Cc: | pgsql-hackers(at)postgreSQL(dot)org, vev(at)michvhf(dot)com |
Subject: | Re: Re[2]: AW: [HACKERS] isnull() or is it?t |
Date: | 1998-12-10 20:26:41 |
Message-ID: | m0zoCfZ-000EBQC@orion.SAPserv.Hamburg.dsh.de |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-hackers |
>
> If it is interesting to someone, we can partially emulate COALESCE
> right now as:
>
> create function coalesce(integer) returns integer as
> 'declare
> nonullo alias for $1;
> begin
> if nonullo then
> return nonullo;
> else
> return 0;
> end if;
> end;
> ' language 'plpgsql';
> CREATE
Pardon, but you still misuse the fact, that PL/pgSQL's IF
expression is implicitly casted into a boolean. That's only
possible for integer values.
Please use
IF nonullo ISNULL THEN
RETURN 0;
ELSE
RETURN nonullo;
END IF;
instead, because this would work for other types (like text,
varchar etc.) too.
Since PL functions can be overloaded (like SQL functions), it
would be possible, but currently not that performant :-(, to
create such a function for all types required.
Jan
--
#======================================================================#
# It's easier to get forgiveness for being wrong than for being right. #
# Let's break this rule - forgive me. #
#======================================== jwieck(at)debis(dot)com (Jan Wieck) #
From | Date | Subject | |
---|---|---|---|
Next Message | Dan Gowin | 1998-12-10 20:50:31 | RE: [HACKERS] PgAccess version 0.93 (for Unix and Windows) has be en released! |
Previous Message | Frank Ridderbusch | 1998-12-10 20:10:21 | subscribe |