Re: Subselect with no records results in final empty set

From: David G Johnston <david(dot)g(dot)johnston(at)gmail(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: Re: Subselect with no records results in final empty set
Date: 2015-01-29 20:03:38
Message-ID: 1422561818538-5836014.post@n5.nabble.com
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Sterpu Victor wrote
> Hello
>
> I have this select where the last subselect will return a empty set and
> because of this the whole select will be empty.
> How can I change this syntax so I will have a row result even if the
> last select is empty?
>
> SELECT * FROM (SELECT 1 AS t1, 2 AS t2) as t, (SELECT 3 AS t3) as s,
> (SELECT * FROM atc WHERE id = '1231222' LIMIT 1 OFFSET 0) AS s3;

Use explicit join syntax; and then pick the "LEFT [OUTER] JOIN" variant.

SELECT
FROM t
LEFT JOIN s3 ON (TRUE)

David J.

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