* Yan Cheng CHEOK wrote:
> I was wondering, is there any good way to drop a constraint? Currently, I am making assumption on the check
constraintname.
> ALTER TABLE backup_table ADD CHECK (fk_lot_id = 99);
>
> If I want to drop the above CHECK constraint, I will do
>
> ALTER TABLE backup_table DROP CONSTRAINT backup_table_fk_lot_id_check; (I assume the constraint name will be
backup_table_fk_lot_id_check)
>
> Is there any more robust way?
Name your constraints:
ALTER TABLE backup_table ADD CONSTRAINT lot_id_ck CHECK (fk_lot_id = 99)
Alternatively, you can get a list of constraints for your table from the
catalog:
SELECT conname
FROM pg_constraint
WHERE conrelid = 'backup_table'::regclass
You may have to add more conditions to the query.
--
Christian