| From: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> |
|---|---|
| To: | Martin Norbäck Olivers <martin(at)norpan(dot)org> |
| Cc: | pgsql-sql <pgsql-sql(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: get counts of multiple field values in a jsonb column |
| Date: | 2020-10-17 15:38:50 |
| Message-ID: | CAKFQuwZKkv3ZLOfmipU-8JRLKTxhQ4ThFwDJQrX45Fk_MoXUiA@mail.gmail.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-sql |
On Sat, Oct 17, 2020 at 8:00 AM Martin Norbäck Olivers <martin(at)norpan(dot)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.
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Rob Sargent | 2020-10-17 16:15:12 | Re: get counts of multiple field values in a jsonb column |
| Previous Message | Martin Norbäck Olivers | 2020-10-17 15:00:05 | get counts of multiple field values in a jsonb column |