From: Tom Lane <tgl@sss.pgh.pa.us>
To: Neil Harkins <nharkins@well.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: concatenation with a null column (using ||) nulls the result?
Date: Mon, 10 Apr 2006 17:47:26 -0400
Message-ID: <921.1144705646@sss.pgh.pa.us> (raw)
In-Reply-To: <Pine.SOL.4.10.10604101430250.2779-100000@well.com>
References: <Pine.SOL.4.10.10604101430250.2779-100000@well.com>
Neil Harkins <nharkins@well.com> writes:
> Is this standard SQL behavior?
Yes. SQL92 6.13 <string value expression>, general rule 2:
2) If <concatenation> is specified, then let S1 and S2 be the re-
sult of the <character value expression> and <character factor>,
respectively.
a) If either S1 or S2 is the null value, then the result of the
<concatenation> is the null value.
...
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, nharkins@well.com
Subject: Re: concatenation with a null column (using ||) nulls the result?
In-Reply-To: <921.1144705646@sss.pgh.pa.us>
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