mysql 多条件查询

-- SELECT * from list_order where  order_payway = 1


SELECT  case order_payway 
when 1 then '货到付款'
when 2 then '支付宝'
when 3 then '微信'
when 4 then '银行卡'
end 
,sum(order_amount) FROM list_order GROUP BY order_payway