Re: car mileage summation / sledgehammer method

Поиск
Список
Период
Сортировка
От Maarten Boekhold
Тема Re: car mileage summation / sledgehammer method
Дата
Msg-id 200008171159.e7HBxem98875@hub.org
обсуждение исходный текст
Ответ на car mileage summation / sledgehammer method  (Oliver Seidel <os10000@in-medias-res.com>)
Ответы Re: car mileage summation / sledgehammer method  ("Ross J. Reedstrom" <reedstrm@rice.edu>)
Список pgsql-sql


> View definition: SELECT mileage.miles, mileage.date FROM mileage;

> detail=# select mileage.miles, mileage.date, sum(dup.miles) from
>          mileage, dup
>        where
>    dup.date <= mileage.date group by mileage.date, mileage.miles
>     order by mileage.date;

Now that's a bit stupid. Why create this view when you can do the same
thing with a table alias (I'm I calling this by the right name?).

select m.miles, m.date, sum(d.miles) from mileage m, mileage d
where.......

Maarten


-----------------------------------------------------------------       Visit our Internet site at
http://www.reuters.com

Any views expressed in this message are those of  the  individual
sender,  except  where  the sender specifically states them to be
the views of Reuters Ltd.


В списке pgsql-sql по дате отправления:

Предыдущее
От: Guo Bin
Дата:
Сообщение: Re: Help on some SQL command...
Следующее
От: Jesus Aneiros
Дата:
Сообщение: Re: Help on some SQL command...