2009/9/2 Tom Lane :
> Pavel Stehule writes:
>> create table x1 (a integer);
>> insert into x1
>> values(2),(2),(3),(3),(4),(4),(5),(5),(6),(6),(6),(8),(9),(9),(10),(10);
>
>> postgres=# select row_number() over (order by a), row_number() over
>> (order by a desc) from x1;
>> row_number | row_num
Pavel Stehule writes:
> create table x1 (a integer);
> insert into x1
> values(2),(2),(3),(3),(4),(4),(5),(5),(6),(6),(6),(8),(9),(9),(10),(10);
> postgres=# select row_number() over (order by a), row_number() over
> (order by a desc) from x1;
> row_number | row_number
> +--
Hello,
I wrote article about statistical function - when I tested Joe Celko's
method, I found some problems on not unique dataset:
on distinct dataset is rule so rows here is max(hi), then there is min(lo):
create table x1 (a integer);
insert into x1 select generate_series(1,10);
postgres=# se
