použijte GROUP_CONCAT
SELECT staff.name,
staff.designation_id_designation,
staff.status_id_status,
GROUP_CONCAT(Concat_Ws('=', leave_remain.leave_type_id_leave_type, leave_remain.days)) AS remain
FROM staff
INNER JOIN leave_remain
ON staff.id_staff = leave_remain.staff_id_staff
GROUP BY staff.name, staff.designation_id_designation, staff.status_id_status
další odkaz(y)