Jak poprawnie złączyć zapytanie:
SELECT SUM(reservations.paid) AS paid, SUM(reservations.payment) AS payment, SUM(reservations.loan) AS loan, SUM( reservations.paid - reservations.payment ) AS paidMinusPayment FROM reservations WHERE reservations.entry_owner_id = 2
z następującym
SELECT SUM(costs.value) AS costsSum FROM costs WHERE costs.entry_owner_id = 2