PostgreSQL Generate create Foreign keys from information_schema or pg_constraint

Question

Recently on a testing infrastructure, to restore multiple tables (via copy command) I dropped all the foreign keys. I have restored this database schema dump into a different database before dropping the FK.

Is there any way that I can generate the create FK from information_schema or pg_constraint?

I tried to get it from a dump file, but the create table statement itself having the FK (not an Alter table statement).

Any suggestions?

Answer 1

I think you are looking for pg_constraint_def, like in the following example:

SELECT pg_get_constraintdef(oid)
FROM pg_constraint
WHERE conname = 'child_accountid_itemid_fkey';

• TheDataGuy: I think it gives a better idea, let me try.