Date: Thu, 15 Aug 2002 07:57:31 +0900
From: Masaru Sugawara <rk73@sea.plala.or.jp>
To: Andre Schubert <andre@km3.de>
Subject: Re: Need Help for select
Cc: pgsql-sql@postgresql.org
In-Reply-To: <20020814160421.2c75727e.andre@km3.de>
References: <20020814201310.C84C.RK73@sea.plala.or.jp>
	<20020814160421.2c75727e.andre@km3.de>
Errors-To: rk73@sea.plala.or.jp
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On Wed, 14 Aug 2002 16:04:21 +0200
Andre Schubert <andre@km3.de> wrote:


> > 
> > 
> > If this mention implies that the tuple of (1, 1) in the c is supposed
                                                            ^^
                                                            b  
> > to take precedence over that of (2, 1),
> 
> I want to compare if a tuple in c exist in b for each c.d_id and b.a_id.
> In c exists 3 tuples: (1,2), (3,4), (5)
> and want to find these tuples in b.


I were able to catch what conditions join b to c. I try to think again.


> 
> select a.name,d.name from a,b,c,d where "tuple found in b" = "tuple found in c" and b.a_id = a.id and c.d_id = d.id
> 
> My english is not so good, but i hope you understand what i want to do.
> 
> Thanks in advance
> 
> > 
> > 
> > SELECT a.name, d.name
> > FROM (SELECT DISTINCT min(b.a_id) AS a_id, c.d_id
> >         FROM b, c
> >        WHERE b.c_id = c.b_id
> >       GROUP BY b.c_id, c.d_id
> >       ) AS t, 
> >       a, 
> >       d
> > WHERE a.id = t.a_id
> >   AND d.id = t.d_id
> > 
> > 


Regards,
Masaru Sugawara