I have a table of (timed) events, and I'm interested in marking events whose properties have changed from the previous event.
I believe this can be done with window functions, but I'm not sure how. What window function can give me a field from the _previous_ row? (To elaborate, I'm interested in: * Finding field x of the _previous_ row * Finding field x of the _next_ row * Finding field x of the _previous_ row that meets a certain criteria (which the current row may or may not meet) ) I must say that window functions are amazing - they're a whole new world, really. -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
