Re: What am I doing wrong?

On Thu, Jan 18, 2001 at 12:29:42AM +1300, Andrew McMillan wrote:
> Tamsin wrote:
> >
> > try this
> >
> > select player,club from players,clubs where players.club_id = clubs.club_id

> Since the foreign key was declared you can also use the "natural join"
> syntax if you are using 7.0.2(?) or later.
>
> Note that you will also need to put the club ids onto the players too:

Yes, I noticed as soon as I posted this that I had completely ommitted
the player's club_ids...


> insert into players values (1, 'Rivaldo', 1);
> insert into players values (2, 'Kleivert', 1);
> insert into players values (3, 'Zidane', 2);
> insert into players values (4, 'Davids', 2);
>
> So:
>
> test=# insert into players values (1, 'Rivaldo', 1);
> test=# insert into players values (2, 'Kleivert', 1);
> test=# insert into players values (3, 'Zidane', 2);
> test=# insert into players values (4, 'Davids', 2);
> test=# insert into clubs values (1, 'Barca');
> test=# insert into clubs values (2, 'Juve');
> test=# SELECT player, club from players natural join clubs;

This works fine and it's simpler.

BTW how do I limit this select to players from 'Juve' ?

I tried appending "where club = 'Juve'", but this returned 0 rows...


>   player  | club
> ----------+-------
>  Rivaldo  | Barca
>  Kleivert | Barca
>  Zidane   | Juve
>  Davids   | Juve
> (4 rows)
>
> test=#
>
> Cheers,
>                                       Andrew.
> --
> _____________________________________________________________________
>            Andrew McMillan, e-mail: Andrew@catalyst.net.nz
> Catalyst IT Ltd, PO Box 10-225, Level 22, 105 The Terrace, Wellington
> Me: +64 (21) 635 694, Fax: +64 (4) 499 5596, Office: +64 (4) 499 2267
> 

--
John