From: | Paul Jungwirth <pj(at)illuminatedcomputing(dot)com> |
---|---|
To: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: json aggregation question |
Date: | 2017-02-28 22:59:15 |
Message-ID: | c9dbbd48-736c-1703-878d-5b1325fef3b8@illuminatedcomputing.com |
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Lists: | pgsql-general |
On 02/28/2017 08:21 AM, Chris Withers wrote:
> How can I aggregate the results of a query that equates to "show me the
> number of matching rows and the set of |tag1| value that have
> a |tag2| value of |t2val1|?
>
> ...but I really want:
>
> |count |tag1 -------+-------------------------2|["val1","val2","val3"](1row)|
Seems like this does the trick?:
SELECT COUNT(DISTINCT id),
json_agg(DISTINCT elem)
FROM (
SELECT id,
jsonb_array_elements_text(tags->'tag1') AS elem
FROM thing
WHERE tags->'tag2'?'t2val1'
) x;
You are looking to get always one result, right?
Yours,
Paul
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