On Sat, 18 Apr 2020 at 23:47, Eugen Konkov <kes-kes(at)yandex(dot)ru> wrote:
> select id, amount, sum(DISTINCT amount) over () as total
> from xx;
> Why this is not possible in PG?
Mainly because nobody has committed anything to implement it yet.
> Why Window-specific functions do not allow DISTINCT to be used within the function argument list.?
> Which problems are exists?
There are some details in [1] which you might be interested in.
David
[1] https://www.postgresql.org/message-id/flat/CAN1Pwonf4waD%2BPWkEFK8ANLua8fPjZ4DmV%2BhixO62%2BLiR8gwaA%40mail.gmail.com