Coba ubah suka dari...
count(select * from bookings where b.id_customer = c.id)
...untuk...
(select count(*) from bookings where b.id_customer = c.id)
Coba ubah suka dari...
count(select * from bookings where b.id_customer = c.id)
...untuk...
(select count(*) from bookings where b.id_customer = c.id)