Re: complex query

* Matt Gerginski <mattgerg(at)users(dot)sourceforge(dot)net> [03.03.2003 19:11]:
> I have two tables, users and options. The common element between the
> tables is "username". I want to select the "email" from "user" but only
> if the "mailing_list" option is set to true in the "options" table.
>
> Here are the tables:
>
> select username, email from users;
> username | email
> ---------------+--------------------------------
> joe | joe(at)yahoo(dot)com
> heidi | heidi(at)localhost
> payday | brant(at)localhost
> fake | fake(at)localhost
> mattgerg | mattgerg(at)users(dot)sourceforge(dot)net
> god | god(at)heaven(dot)org
>
> select username, mailing_list from options;
> username | mailing_list
> ---------------+--------------
> payday | t
> god | t
> fake | t
> mattgerg | t
>
>
> I want to write a query that will return the emails of only the users
> payday, god, fake, and mattgerg.
>
> Is this at all possible? I am new to sql, and I am having trouble.
>

select u.username, u.email from users as u, options as o where u.username =
o.username and o.mailing_list = true;

You'd better read some book on SQL.

--

Victor Yegorov