Re: JSONB_AGG: aggregate function calls cannot be nested

On Sat, Feb 20, 2021 at 11:46 AM Alexander Farber <
alexander(dot)farber(at)gmail(dot)com> wrote:

> Then I have to split the query in 3 similar ones (with same condition)?
>
> I try:
>
> SELECT
> JSONB_AGG(TO_CHAR(finished, 'YYYY-MM-DD')) AS day
> FROM words_games
> WHERE finished > CURRENT_TIMESTAMP - INTERVAL '2 week'
> GROUP BY day
> ORDER BY day;
> ERROR: aggregate functions are not allowed in GROUP BY
> LINE 2: JSONB_AGG(TO_CHAR(finished, 'YYYY-MM-DD')) A...
> ^
>

That's a whole different misunderstanding of aggregates that you are seeing.

I mis-spoke in the prior response though. Its not that you only get one
column of an aggregate function per select - you only get to use a single
aggregate in each expression in a select/group-by. array_agg(sum(...)) is
two aggregates in a single expression.

David J.