On Wed, 14 Aug 2002 21:57:02 +0900 "Masaru Sugawara" <[EMAIL PROTECTED]> wrote:
> On Wed, 14 Aug 2002 09:10:53 +0200 > Andre Schubert <[EMAIL PROTECTED]> wrote: > > > The ride side as follows. > > Table d contains information about subitems. > > Table c holds information about subitems and items of type bar. > > Each subitem can have 0..n items bar selected. > > > > What i want is that a subitem is only activated for a foo item if > > the foo-item has exactly selected the same bar items selected as > > as the relation between table c and d. > > > > Example 1: > > The foo-item A_Name1 has selected the bar-items 1 and 2. > > The subitem D_Name1 is only activated for a foo-item if that foo-item > > has selected the bar-items 1 and 2, this happens for A_Name1. > > > > > If this mention implies that the tuple of (1, 1) in the c is supposed > 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. 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 > > > > ---------------------------(end of broadcast)--------------------------- > TIP 3: if posting/reading through Usenet, please send an appropriate > subscribe-nomail command to [EMAIL PROTECTED] so that your > message can get through to the mailing list cleanly ---------------------------(end of broadcast)--------------------------- TIP 6: Have you searched our list archives? http://archives.postgresql.org
