Hello, Many thanks to andreas.kretschmer for this helpful reply about how to set up a window function to perform a running total: http://archives.postgresql.org/pgsql-general/2010-03/msg01122.php It works perfectly with the simple test data but I've just got back to work, tried implementing it on my live data and the results are slightly different. My query is almost exactly the same - I've simplified by grouping by year only rather than year and month: select extract(year from signup_date), count(email_address), sum(count(email_address)) over (rows unbounded preceding) from email_list group by 1 order by 1; date_part | count | sum -----------+-------+------ 2007 | 501 | 1374 2008 | 491 | 491 2009 | 382 | 873 2010 | 66 | 1440 (4 rows) What I'm looking for is date_part | count | sum -----------+-------+------ 2007 | 501 | 501 2008 | 491 | 992 2009 | 382 | 1374 2010 | 66 | 1440 It seems to be adding up the counts but not in the right order. I've also tried an explicit ORDER BY inside the partition with no difference: select extract(year from signup_date), count(email_address), sum(count(email_address)) over (partition by 1 order by 1 asc rows unbounded preceding) from email_list group by 1 order by 1; Does anyone have any other ideas? Regards Oliver Kohll oliver@xxxxxxxxxxxxxxx / +44(0)7814 828608 / skype:okohll www.agilebase.co.uk - software www.gtwm.co.uk - company -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
