insert into region values (1, 'EMEA');
insert into city values (1, 'Poznań', 1, null);
insert into shop values (1, 'P1', 'ul. Wielka 3', 1, null);
insert into shop values (6, 'P1', 'ul. Wielka 3', null, null);

insert into region values (2, 'North America');
insert into city values (2, 'New Orleans', 2, null);
insert into shop values (2, 'Waffle House', 'Washington Ave. 4', 2, null);
insert into shop values (3, 'Wendy''s', 'Kenner 5', 2, null);

insert into region values (3, 'Australia');
insert into city values (3, 'Canberra', 3, null);
insert into shop values (4, 'S10', '???', 3, null);
insert into shop values (5, 'S20', '???', 4, null);