Re: Need help with INNER Join

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От
Frank Bax
Тема
Re: Need help with INNER Join
Дата
в 11:52:47
Msg-id
481DCDB6.10409@sympatico.ca
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Need help with INNER Join "Mag Gam" <magawake@gmail.com>
Re: Need help with INNER Join Emil Obermayr <nobs@nobswolf.info>
Re: Need help with INNER Join Frank Bax <fbax@sympatico.ca>
Re: Need help with INNER Join "Mag Gam" <magawake@gmail.com>
Mag Gam wrote:
> When I needed to join tables I always used the equal syntax (ie. SELECT 
> id from foo,fee where id.foo=id.fee)
>  
> To my understanding, it is preferred to use the INNER JOIN keyword. I am 
> able to INNER JOIN 2 tables, but I am not sure of the syntax for 3 or 
> more tables. Can someone please show me an example for that ?


Your example will not work; you should have written:

SELECT foo.id from foo,fee where foo.id=fee.id

With inner join, this would be

SELECT foo.id FROM foo
INNER JOIN fee on foo.id=fee.id

Joining a third table would look like

SELECT foo.id FROM foo
INNER JOIN fee ON foo.id=fee.id
INNER JOIN bar ON bar.id=foo.id


В списке pgsql-novice по дате отправления
От: Mag Gam
Дата:
Сообщение: Need help with INNER Join
От: Emil Obermayr
Дата:
Сообщение: Re: Need help with INNER Join
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