The ts means the time the user started on a project ?
Or the time he finished?
Or can mean both? If so, how do you can tell one from the other? Different
event_type s ?
Is it correct to assume from your words that an user cannot be in more than
one project at the time? If so, can't be overlapping, right?
Best,
Oliveiros
----- Original Message -----
From: "Andreas" <maps...@gmx.net>
To: <pgsql-sql@postgresql.org>
Sent: Thursday, June 09, 2011 2:43 PM
Subject: [SQL] need help with some aggregation magic
hi,
I have a log-table that stores events of users and projects like this
( user_id integer, project_id integer, ts timestamp, event_type integer )
I need an aggregated list of worktime per user, per project, per day.
The users can switch projects during the day so I can't work this out with
min(ts) and max(ts).
Is there a clever way to get this with SQL ?
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