"Louis-David Mitterrand" <[EMAIL PROTECTED]> writes: > Each message a unique id_forum and an id_parent pointing to the replied > post (empty if first post). > > How can I build an elegant query to select all messages in a thread?
You would need recursive queries which Postgres doesn't support. There is a patch out there to add support but I don't think it's up-to-date with 8.2 and in any case the resulting queries can be quite intense. I would recommend you look into the contrib module named "ltree". It's easy to use and works well with the gist indexes. It does require changing your data model denormalizing it slightly which makes it hard to "reparent" children, but if that isn't an operation you have to support I think it makes most other operations you might want to do much easier to support. -- Gregory Stark EnterpriseDB http://www.enterprisedb.com ---------------------------(end of broadcast)--------------------------- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
