| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
| Cc: | Andrey <andrey(at)ulab(dot)ru>, pgsql-bugs(at)postgresql(dot)org |
| Subject: | Re: BUG #5123: bug in window function "last_value" |
| Date: | 2009-10-16 13:55:28 |
| Message-ID: | 5398.1255701328@sss.pgh.pa.us |
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| Lists: | pgsql-bugs |
Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> writes:
> Andrey wrote:
>> select id, first_value(id) over(order by id), last_value(id) over(order by
>> id) from t;
>>
>> RESULT:
>> id | first_value | last_value
>> ----+-------------+------------
>> 1 | 1 | 1
>> 2 | 1 | 2
>> 3 | 1 | 3
>> (3 rows)
>>
>> fist_value - good, last_value - bad
> Looks ok to me. What did you expect?
These *are* the correct answers, since the default window frame runs
from first row to current row. If you don't like them, you may need
to specify a different window frame.
regards, tom lane
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| Next Message | Hitoshi Harada | 2009-10-16 13:58:47 | Re: BUG #5123: bug in window function "last_value" |
| Previous Message | Tom Lane | 2009-10-16 13:51:12 | Re: BUG #5122: Subqueries - inner select statement bug |