mysql - 如何合并两个mysql查询

Question

我想将这两个查询结合起来，两个 captain 应该相等:

select distinct(captain_name),sum(finaldiscount) as tot,payment_mode 
from   order_master 
where  payment_mode='card' 
group  by captain_name

select distinct(captain_name),sum(finaldiscount) as tot,payment_mode 
from   order_master 
where  payment_mode='cash' 
group  by captain_name

Answer 1

试试这个:

SELECT captain_name,
       Sum(finaldiscount) AS tot,
       payment_mode
FROM   order_master
WHERE  payment_mode IN( 'cash', 'card' )
       AND captain_name IN (SELECT captain_name
                            FROM   order_master
                            WHERE  payment_mode IN( 'cash', 'card' )
                            GROUP  BY captain_name
                            HAVING Count(DISTINCT payment_mode) = 2)
GROUP  BY captain_name,payment_mode 

子查询将只返回那些同时具有 payment_mode 即 card 和 cash 的 captain_name。然后选择那些 captain_name 的行，并按 captain_name,payment_mode group by。

如果您不想为 card 和 cash 单独的行，那么使用这个:

SELECT captain_name,SUM(finaldiscount)
FROM   order_master
WHERE  payment_mode IN( 'cash', 'card' )
GROUP  BY captain_name
HAVING Count(DISTINCT payment_mode) = 2

注意:我假设two captain should be equal 意味着只有那些由两个查询返回的船长，应该由组合查询返回。