From: Tom Lane <tgl@sss.pgh.pa.us>
To: jtx@hatesville.com
Cc: pgsql-sql@postgresql.org
Subject: Re: CASE
Date: Mon, 19 May 2003 20:17:30 -0400
Message-ID: <24789.1053389850@sss.pgh.pa.us> (raw)
In-Reply-To: <002201c31dd4$3f34c100$0000fea9@theplague>
References: <002201c31dd4$3f34c100$0000fea9@theplague>
"James Taylor" <jtx@hatesville.com> writes:
> select case(sum(numbers)) when null then 0 else sum(numbers) end from
> list_results;
The reason the above doesn't work is that it expands to
CASE WHEN sum(numbers) = null THEN ...
which always fails ("= null" does not mean "is null").
Easier would be SELECT COALESCE(sum(numbers), 0) FROM list_results
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, jtx@hatesville.com
Subject: Re: CASE
In-Reply-To: <24789.1053389850@sss.pgh.pa.us>
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