if not exists (select * from sl_Deliverer where dr_Id = 1 ) insert into sl_deliverer values (1, 'Poczta Polska', NULL, 6, '') if not exists (select * from sl_Deliverer where dr_Id = 2 ) insert into sl_deliverer values (2, 'Ruch', NULL, 3, '') if not exists (select * from sl_Deliverer where dr_Id = 3 ) insert into sl_deliverer values (3, 'InPost', NULL, 5, '') if not exists (select * from sl_Deliverer where dr_Id = 4 ) insert into sl_deliverer values (4, 'DHL', NULL, 4, '') if not exists (sel