On 2/8/07, Madison Kelly <linux@xxxxxxxxxxx> wrote:
Hi all, I've got a 'history' schema that records changes in the public schema tables over time. I use a trigger and function to do this. What I would like to do though, and this may not even be possible, is say something like (pseudo-code) "SELECT DIFF foo_name FROM history.foo WHERE foo_id=X;" and have a *nix 'diff' style results shown (sort of like looking at diffs in CVS/SVN).
you can start by using the 'except' boolean query operator; select * from foo except * from bar; This will give you rows in foo that are not exactly in bar (matching every field). If you want it in both directions you can: (select * from foo except select * from bar) union (select * from bar except select * from foo); you can then take the results of these queries and mark up the text however you want. Just a heads up: the boolean sql operators are famous for generating sequential scans. merlin
