From: | David G Johnston <david(dot)g(dot)johnston(at)gmail(dot)com> |
---|---|
To: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: How to select rows for which column has empty array ? |
Date: | 2014-06-06 15:12:48 |
Message-ID: | 1402067568574-5806343.post@n5.nabble.com |
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Thread: | |
Lists: | pgsql-general |
Arup Rakshit wrote
> I have a below table :
>
> yelloday_development=# select id,workplace_ids,team_ids from
> reporting_groups ;
>
>
> id | workplace_ids | team_ids
> ----+---------------+----------
> 2 | {} | {}
> 3 | {} | {}
> 1 | {} | {}
> 4 | {1} | {1}
> 5 | {2} | {2,3,4}
> (5 rows)
>
> yelloday_development=# select id from reporting_groups where 2 = ANY
> (team_ids)
> yelloday_development-# ;
> id
> ----
> 5
> (1 row)
>
> How would I select rows which has empty array for the field "team_ids" ?
The generic way would be to checks its length:
WHERE array_length(team_ids, 1) = 0
you could also check for equality with the empty array:
WHERE teams_ids = array[]::integer[]
David J.
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