Question

I’m inserting a value in table A, that has a serial type as primary key. I wanna use the returned value of the query as a foreign key of table B… but I get this message:

ERROR: insert or update on table "tb_midia_pessoa" violates foreign key constraint "tb_midia_pessoa_id_pessoa_fkey" DETAIL: Key (id_pessoa)=(30) is not present in table "tb_pessoa". )

How can I make this possible without:

• starting a new Transaction
• droping my foreign keys constraints =O
  ?

Regards!
Pedro

Answer 1

You can make a deferrable FK, just use DEFERRABLE and maybe INITIALLY DEFERRED, that’s up to you.

http://www.postgresql.org/docs/current/static/sql-createtable.html