2008/12/31 Tom Lane <tgl@sss.pgh.pa.us>:
> "Pavel Stehule" <pavel.stehule@gmail.com> writes:
>> so I have to modify query to get expected values
>> postgres=# select a, b, last_value(a) over (partition by b),
>> last_value(a) over (partition by b order by a RANGE BETWEEN UNBOUNDED
>> PRECEDING AND UNBOUNDED FOLLOWING) from foo;
>
>> it should be noticed in doc?
>
> It is --- see the comments at the bottom of
>
> http://developer.postgresql.org/pgdocs/postgres/functions-window.html
>
> regards, tom lane
>
there is maybe bug. It works well with explicit definition, but it not
works when I will window
good
postgres=# select a, b, sum(a) over (partition by b order by a ROWS
BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING) from foo;a | b | sum
----+---+----- 1 | 1 | 19 1 | 1 | 19 2 | 1 | 19 2 | 1 | 19 4 | 1 | 19 4 | 1 | 19 5 | 1 | 1911 | 3 | 9312 | 3 |
9316| 3 | 9316 | 3 | 9316 | 3 | 9322 | 3 | 93
(13 rows)
wrong
postgres=# select a, b, sum(a) over (w) from foo window w as
(partition by b order by a ROWS BETWEEN UNBOUNDED PRECEDING AND
UNBOUNDED FOLLOWING);a | b | sum
----+---+----- 1 | 1 | 2 1 | 1 | 2 2 | 1 | 6 2 | 1 | 6 4 | 1 | 14 4 | 1 | 14 5 | 1 | 1911 | 3 | 1112 | 3 |
2316| 3 | 7116 | 3 | 7116 | 3 | 7122 | 3 | 93
(13 rows)
regards
Pavel Stehule