Re: HELP, can't implement e filter

[Ben Kim <bkim(at)tamu(dot)edu>]

On Sun, 19 Aug 2007, giuseppe(dot)derossi(at)email(dot)it 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