Re: Help with SQL statement - Thanks

Поиск
Список
Период
Сортировка
От Tom Moreau
Тема Re: Help with SQL statement - Thanks
Дата
Msg-id OseViQLDBHA.1380@tkmsftngp07
обсуждение исходный текст
Ответ на Help with SQL statement - Thanks  ("Henry" <henry_lu@hotmail.com>)
Список pgsql-sql
For this, you need a derived table:

select
from   Payments    p
join
(
select   CustomerNo
,   Date = max (Date)
from   Payments
group by   CustomerNo
)  as x on x.CustomerNo = p.CustomerNo          and p.Date = x.Date


--  Tom

----------------------------------------------------------
Thomas A. Moreau, BSc, PhD, MCSE, MCDBA, MCT
SQL Server MVP
Columnist, SQL Server Professional

Toronto, ON Canada
www.pinnaclepublishing.com/sql
www.apress.com
---
Henry wrote in message ...
There is a table called "Payments" which records every payment that a
company has received:

CustomerNo     Date    Amount
----------------------------------------
3214                2/12    30
3214                4/10    50
9943                4/18    40
9943                5/10    30
9943                2/13    70
1121                5/23    10
1121                4/20    40
1121                3/12    30
(more data...)


I want to be able to pull out the last payment made by everyone in a query:

CustomerNo     Date    Amount
---------------------------------------
3214                4/10    50
9943                5/10    30
1121                5/23    10
(other users...)

How should I write the SQL statement? Please email to me at
henry_lu@hotmail.com. Thank you very much.

Henry







В списке pgsql-sql по дате отправления:

Предыдущее
От: Mathew White
Дата:
Сообщение: Re: SQL - histogram
Следующее
От: Raymond Chui
Дата:
Сообщение: Performance tuning in PostgreSQL?