insert into customer values
('bob', 'smith', '12 a road', 'bob@email.com', 'xbox', '1988-08-10'),
('paul', 'jones', '13 a road', 'paul@email.com', 'pc', '1988-08-11'),
('leo', 'overhill', '14 a road', 'leo@email.com', 'playstation', '1988-08-12'),
('ben', 'potter', '15 a road', 'ben@email.com', 'nintendo 64', '1988-08-13'),
('billy', 'agran', '16 a road', 'billy@email.com', 'pc', '1988-08-14');

insert into games values
('overwatch', 'pc', '13', '30'),
('fifa', 'xbox', '8', '30'),
('spyro', 'playstation', '5', '30'),
('hearthstone', 'pc', '9', '30'),
('worms', 'pc', '16', '30'),
('mario kart', 'nintendo 64', '7', '30'),
('lemmings', 'playstation', '3', '30'),
('forza', 'xbox', '20', '30'),
('gta', 'xbox', '18', '30'),
('donkey kong', 'nintendo 64', '2', '30');

insert into sales values
('1', '1', '2018/04/15', '30'),
('3', '3', '2018/04/15', '30'),
('4', '4', '2018/04/15', '30'),
('5', '5', '2018/04/15', '30'),
('3', '6', '2018/04/15', '30'),
('3', '7', '2018/04/15', '30'),
('2', '8', '2018/04/15', '30'),
('4', '9', '2018/04/15', '30'),
('5', '10', '2018/04/15', '30'),
('1', '1', '2018/04/15', '30'),
('1', '2', '2018/04/15', '30'),
('2', '3', '2018/04/15', '30'),
('2', '4', '2018/04/15', '30'),
('4', '5', '2018/04/15', '30');