Question

I have two tables (tbl and tbl_new) that both use the same sequence (tbl_id_seq). I’d like to drop one of those tables. On tbl, I’ve removed the modifier “not null default nextval(‘tbl_id_seq’::regclass)” but that modifier remains on tbl_new. I’m getting the following error:

ERROR: cannot drop table tbl because other objects depend on it
DETAIL: default for table tbl_new column id depends on sequence tbl_id_seq

After reviewing http://www.postgresql.org/docs/9.1/static/sql-droptable.html
It looks like there is only CASCADE and RESTRICT as options.

Answer 1

You need to decouple the sequence and the table it “belongs” to:

ALTER SEQUENCE "tbl_id_seq" OWNED BY NONE;

I suppose it was created automatically (and “bound”) by defining the tbl_id field of tbl as SERIAL.