How to find out top 3 records in each location

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От	wen tseng
Тема	How to find out top 3 records in each location
Дата	20 ноября 2006 г. 13:09:04
Msg-id	00e001c70cc6$926292a0$6f0aa8c0@miswen обсуждение исходный текст
Ответы	Re: How to find out top 3 records in each location Re: How to find out top 3 records in each location
Список	pgsql-sql

On PostgreSQL, I have a table like this:

Item Location Sales

A X 10

B X 6

C Y 3

D Y 8

E Y 15

F Y 11

I'd like to find out top 3 items in each location and put those 3 items as colum values like this:

Location Top1 Top2 Top3

X A B

Y E F D

Since PostgreSQL doesn't support TOP, how can I do to get this result?

Any solution will be appreciated.

Thank you in advance.

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