Heikki Linnakangas <heikki.linnakangas@enterprisedb.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