Re: aggregate functions are not allowed in UPDATE

Ahh, the subqueries -

On Tue, Jan 15, 2019 at 5:59 PM David G. Johnston <
david(dot)g(dot)johnston(at)gmail(dot)com> wrote:

> On Tue, Jan 15, 2019 at 9:52 AM Alexander Farber
> <alexander(dot)farber(at)gmail(dot)com> wrote:
> >> So calculate the average somewhere else, put the result in a column,
> >> and then reference that column in the SET clause.
> >
> > do you suggest to add a second CTE?
>
> That would qualify as "somewhere else" - as would a simple subquery in
> FROM.
>

they escaped my mind for some reason! :-)

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 =
(
SELECT
AVG(diff)
FROM diffs
GROUP BY uid
)
WHERE uid = 1;

https://www.db-fiddle.com/f/w1AYGpoZiWW9bLCYjHDk7H/1

seems to work, thank you