SUM(r.zCommission)-SUM(r.fCommission) as commission,
SUM(r.zCommission) as price
FROM
(
SELECT user_id,commission as zCommission,0 as fCommission,price FROM app_user_selling_water WHERE order_id = #{orderId} and `status`= 0 and waiting = 1
UNION ALL
SELECT user_id,0 as zCommission,commission as fCommission,price FROM app_user_selling_water WHERE order_id = #{orderId} and `status`= 1 and waiting = 1