On Thu, 12 Sep 2002, Gaetano Mendola wrote:
> Hi all, > > Suppose that I have a table like this: > > > att_1 | att_2 | att_3 | att_4 > -------------------------------- > 1 | a | y | y1 > 2 | b | y | y2 > 3 | a | xx | y3 > 4 | c | zz | y4 > 5 | a | t | y5 > 6 | c | x | y6 > > > > I want obtain all row that have for each att_2 > the max of att_1 > > some like > > SELECT * > FROM MY_TABLE > GROUP BY att_2 > HAVING att_1 = max ( id_user_log) If you don't mind using postgres extensions and don't need a particular att_1 ordering: select distinct on (att_2) * from test order by att_2, att_1 desc; Otherwise I'm not sure you can do it without a subselect somewhere. ---------------------------(end of broadcast)--------------------------- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
