Joe Stump <joe@joestump.net> writes: > I had to insert the initial record and then add the foreign key > restraint after inserting the initial record was created (0 being the > first level of the category structure) - Why? It worked fine for me without any workaround ... regression=# CREATE TABLE categories ( regression(# categoryID integer PRIMARY KEY, regression(# parentID integer REFERENCES categories (categoryID) ON DELETE CASCADE, regression(# name text); NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "categories_pkey" for table "categories" CREATE TABLE regression=# insert into categories values(0,0,'root'); INSERT 1349044 1 regression=# insert into categories values(1,2,'root'); ERROR: insert or update on table "categories" violates foreign key constraint "$1" DETAIL: Key (parentid)=(2) is not present in table "categories". regression=# insert into categories values(1,0,'root'); INSERT 1349046 1 regression=# regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 4: Don't 'kill -9' the postmaster
