| From: | David Rowley <dgrowleyml(at)gmail(dot)com> |
|---|---|
| To: | Eugen Konkov <kes-kes(at)yandex(dot)ru> |
| Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Implementation DISTINCT for window aggregate function: SUM |
| Date: | 2020-04-19 03:07:38 |
| Message-ID: | CAApHDvpPqApuv_i_GdZF2wP7LTUugP3OV2WeGW2Yr1uXYjQZrg@mail.gmail.com |
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| Lists: | pgsql-hackers |
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] /message-id/flat/CAN1Pwonf4waD%2BPWkEFK8ANLua8fPjZ4DmV%2BhixO62%2BLiR8gwaA%40mail.gmail.com
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