Re: get counts of multiple field values in a jsonb column

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От David G. Johnston
Тема Re: get counts of multiple field values in a jsonb column
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Msg-id CAKFQuwZKkv3ZLOfmipU-8JRLKTxhQ4ThFwDJQrX45Fk_MoXUiA@mail.gmail.com
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Ответ на get counts of multiple field values in a jsonb column  (Martin Norbäck Olivers <martin@norpan.org>)
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On Sat, Oct 17, 2020 at 8:00 AM Martin Norbäck Olivers <martin@norpan.org> wrote:
I'm looking at all the aggregation functions but can't quite find one that suits this purpose.

I would love to get some input on ways to make this faster.

If you want counts the count function is your goto aggregate function.  What you are missing is performing conditional counting.

SELECT fld, count(*) FILTER (WHERE expression) FROM query GROUP BY fld;

https://www.postgresql.org/docs/13/sql-expressions.html#SYNTAX-AGGREGATES

David J.

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