i guess my first attempt to send a reply failed. --- Richard Broersma Jr <[EMAIL PROTECTED]> wrote:
> > Hi all, > > I guess this is an already asked question, but I didn't found an answer, so > > apologize me. Imagine I've got two tables: > > skill(id,description) // primary key => id > > family(id,description) // primary key => id > > and I want to associate skills to families: > > ass_sf(id_skill,id_family) // appropriate foreign keys > > > > Tables are already created and the database is running. Now I'd like to > > implement a delete cascade, thus when I delete a skill also its association > > with the family must be deleted. I gues I should have declared the skill > > table as follows: > > CREATE TABLE skill > > ( > > id varchar(20) on delete cascade, > > description varchar(50), > > primary key(id) > > ); > > > > right? The problem is: how can I alter the table to add the column > > constraint > > now, without redeclaring the table? > > Thanks very much for helping me. > > This link has one line that is very similar to what you want to do. You will > probably have to > start a transaction, drop the foriegn key contraint and then add a new > foriegn key contraint > with > the on drop cascade . > > http://archives.postgresql.org/pgsql-general/2006-10/msg00467.php > > Regards, > > Richard Broersma Jr. > > ---------------------------(end of broadcast)--------------------------- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq
