| From: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> |
|---|---|
| To: | Alexander Farber <alexander(dot)farber(at)gmail(dot)com> |
| Cc: | pgsql-general <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: aggregate functions are not allowed in UPDATE |
| Date: | 2019-01-15 16:46:32 |
| Message-ID: | CAKFQuwaN3FoNqjGEzKTaZhO=5d4qR2LgHk-4AF7cQ2DreLNxXg@mail.gmail.com |
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| Lists: | pgsql-general |
On Tue, Jan 15, 2019 at 9:42 AM Alexander Farber
<alexander(dot)farber(at)gmail(dot)com> wrote:
> When I am trying
>
> WITH diffs AS (
> SELECT
> gid,
> uid,
> played - LAG(played) OVER(PARTITION BY gid ORDER BY played) AS diff
> FROM moves
> WHERE uid = 1
> )
> UPDATE users SET
> avg_time = TO_CHAR(AVG(diff), 'HH24:MI')
> FROM diffs;
>
> the syntax error is unfortunately printed by PostgreSQL 10:
>
> aggregate functions are not allowed in UPDATE
So calculate the average somewhere else, put the result in a column,
and then reference that column in the SET clause.
Its also unusual to have FROM with UPDATE but no WHERE clause...
David J.
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