On 24/07/07, Louis-David Mitterrand <[EMAIL PROTECTED]> wrote:
On Tue, Jul 24, 2007 at 03:10:44PM +0100, Gregory Stark wrote: > "Louis-David Mitterrand" <[EMAIL PROTECTED]> writes: > > > Can I use a another column to store the type of the id_subject (ie: the > > tabled it belongs to) ? Then I would be able to query that table for > > additional info to print alongside the forum posts. > > There are ways to identifier tables in Postgres but there's no way to run a > query against a table using them. Bummer, I suspected as much. > I would strongly recommend you define your own list of "object_types", > probably even have an object_type table with a primary key, a description > column, and a table_name column. Then you can in your application construct > the appropriate query depending on the object_type. Good fallback solution. > One alternative you could do is have a set-returning plpgsql function which > has a big if statement and performs the right kind of query. I think the > records would have to all be the same -- they can't be different kinds of > records depending on the type of object. Will look at that one, always willing to dig deeper into pg's more complex ways :) Thanks for your help, ---------------------------(end of broadcast)--------------------------- TIP 6: explain analyze is your friend
The words table partitioning spring to mind. you could build a view of all the sub tables and then select by tablename='whatever' You may also want to look into inheritance.... Only some ideas Peter.
