group by

Поиск
Список
Период
Сортировка
От Kathy Zhu
Тема group by
Дата
Msg-id 200310032230.h93MUHc29961@amon.Central.Sun.COM
обсуждение исходный текст
Ответы Re: group by
Re: group by
Re: group by
Список pgsql-general
Hi,

I notices a weird thing here.

version 7.2.1
on Solaris

table "test", has a field "state".
There are 4 "state" values, 1, 2, 3, 4.

select count(*) from test group by state;
took 11500 msec

but

select count(*) from test where state = 1;
select count(*) from test where state = 2;
select count(*) from test where state = 3;
select count(*) from test where state = 4;
total took 626 msec

Why ??

thanks,
kathy



В списке pgsql-general по дате отправления:

Предыдущее
От: "scott.marlowe"
Дата:
Сообщение: Re: pg_restore takes ages
Следующее
От: Dennis Gearon
Дата:
Сообщение: Re: group by