"Louis-David Mitterrand" <vindex+lists-pgsql-sql@apartia.org> 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.
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.
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.
-- Gregory Stark EnterpriseDB http://www.enterprisedb.com