On Thu, Mar 1, 2012 at 4:35 PM, Alessandro Gagliardi <alessandro@xxxxxxxx> wrote: > Interesting solution. If I'm not mistaken, this does solve the problem of > having two entries for the same user at the exact same time (which violates > my pk constraint) but it does so by leaving both of them out (since there is > no au1.hr_timestamp > au2.hr_timestamp in that case). Is that right? Yes, but it would have to be same *exact* time (not same hour). You can use more fields to desambiguate too, ie: au1.hr_timestamp > au2.hr_timestamp or (au1.hr_timestamp == au2.hr_timestamp and au1.some_other_field > au2.some_other_field) If you have a sequential id to use in desambiguation, it would be best. -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
