On Wed, 15 Apr 2009 15:32:42 +0100, Shug Boabby wrote: > I simplified my problem a little too much and now I'm stuck trying to > use cumulative_sum(). My schema is not only A, B but also has a C > > A B C > 1 0 1 > 2 1 1 > 3 0 1 > 4 2 1 > 5 1 1 > 1 0 2 > 2 1 2 > 3 0 2 > 4 2 2 > 5 1 2 > > and I want to be able to do the cumulative sum only when C is the same. E.g. > > A funkySumB C > 1 0 1 > 2 1 1 > 3 1 1 > 4 3 1 > 5 4 1 > 1 0 2 > 2 1 2 > 3 1 2 > 4 3 2 > 5 4 2 If I understand the problem correctly, why not just something like this?: SELECT t1.a, sum(t2.b), t1.c FROM abc t1 JOIN abc t2 ON t2.a <= t1.a AND t2.c=t1.c GROUP BY t1.a, t1.c; -- Michał Politowski Talking has been known to lead to communication if practiced carelessly. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
