On Thu, May 11, 2017 at 3:03 PM, Rajkumar Raghuwanshi <rajkumar.raghuwan...@enterprisedb.com> wrote: > Hi All, > > I have created a table with primary key, and then dropped primary key from > table. But table still have not null constraint added by primary key. > > Is there any other statement to delete primary key with not null? > or this is an expected behaviour of pg? > > postgres=# create table tbl (c1 int primary key); > CREATE TABLE > postgres=# \d+ tbl > Table "public.tbl" > Column | Type | Collation | Nullable | Default | Storage | Stats target > | Description > --------+---------+-----------+----------+---------+---------+--------------+------------- > c1 | integer | | not null | | plain | > | > Indexes: > "tbl_pkey" PRIMARY KEY, btree (c1) > > postgres=# alter table tbl drop constraint tbl_pkey; > ALTER TABLE > postgres=# \d+ tbl > Table "public.tbl" > Column | Type | Collation | Nullable | Default | Storage | Stats target > | Description > --------+---------+-----------+----------+---------+---------+--------------+------------- > c1 | integer | | not null | | plain | > |
I don't think we have a way to tell whether NOT NULL constraint was added for primary key or independently. So, I guess, we can not just drop it while dropping primary key constraint. -- Best Wishes, Ashutosh Bapat EnterpriseDB Corporation The Postgres Database Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
