Re: inner join and limit

Поиск
Список
Период
Сортировка
От msi77
Тема Re: inner join and limit
Дата
Msg-id 307921275836315@web135.yandex.ru
обсуждение исходный текст
Ответ на inner join and limit  (Michele Petrazzo - Unipex <michele.petrazzo@unipex.it>)
Список pgsql-sql
Hi,
Some ways to do that:
http://www.sql-ex.ru/help/select16.php

> Hi list,
> I have two table that are so represented:
> t1:
> id int primary key
> ... other
> t2:
> id int primary key
> t1id int fk(t1.id)
> somedate date
> ... other
> data t1:
> 1 | abcde
> 2 | fghi
> data t2:
> 1 | 1 | 2010-05-23
> 2 | 1 | 2010-05-24
> 3 | 1 | 2010-05-25
> 4 | 2 | 2010-05-22
> 5 | 2 | 2010-05-26
> I'm trying to create a query where the data replied are:
> join t1 with t2 and return only the LIMIT 1 (or N) of the t2, with date 
> order (of t2).
> Data should be:
> t1.id | t2.id | t2,somedate
> 1 | 3 | 2010-05-25
> 2 | 5 | 2010-05-26
> As said, I'm trying, but without success...
> Can be done for you?
> Thanks,
> Michele
> 

Здесь спама нет http://mail.yandex.ru/nospam/sign


В списке pgsql-sql по дате отправления:

Предыдущее
От: Sergey Konoplev
Дата:
Сообщение: Re: Difference between these two queries ?
Следующее
От: "Little, Douglas"
Дата:
Сообщение: Re: Difference between these two queries ?