On Sun, 19 Aug 2007, [EMAIL PROTECTED] wrote:
Hi,
I need to implement a filter in order to select from the first table the
second one...
c1 c2 c3 c4 c5
1)133659;1;"0039";"00121";7
2)133664;1;"0039";"00121";12
3)133664;2;"0039";"00121";12
4)133665;2;"0039";"00121";12
5)135460;1;"0039";"01152";
6)135460;2;"0039";"01152";
7)135471;1;"0050";"00153";4
8)135471;2;"0050";"00153";4
1)133659;1;"0039";"00121";7
3)133664;2;"0039";"00121";12
4)133665;2;"0039";"00121";12
6)135460;2;"0039";"01152";
8)135471;2;"0050";"00153";4
There should be something better but this might work.
select * from testtable where (c1,c2) in (select c1, max(c2) from
testtable group by c1 );
HTH
Ben K.
Developer
http://benix.tamu.edu
---------------------------(end of broadcast)---------------------------
TIP 3: Have you checked our extensive FAQ?
http://www.postgresql.org/docs/faq
