select t2.id from gamers t1,games t2 where t1.user="jack" and t2.id<>t1.gid
group by t2.id
---- Original Message -----
From: zbynek <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, January 31, 2001 4:31 PM
Subject: Selecting games which a given user can join
> Hi there!
>
> I'm new to SQL and I can't figure out a query which would give me the
result
> I need. What I want to do is this:
>
> I have table that stores names of players and number of the game they play
> (one player can play more games concurrently). Other users can join the
> game. For given user I want to display the games which he can join. The
only
> condition is that the user can't join any game which he already plays.
>
> If I have this
>
> +-----+---------+
> | gid | user |
> +-----+---------+
> | 1 | jack |
> | 1 | john |
> | 1 | peter |
> | 1 | richard |
> | 2 | john |
> | 2 | richard |
> | 3 | peter |
> | 4 | jack |
> | 4 | peter |
> | 5 | peter |
> | 5 | john |
> +-----+---------+
>
> then for jack I want numbers 2, 3, 5 but not 4; for peter it should be 2
and
> no other.
>
> I'll appreciate your advice!
>
> zbynek
>
>
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