mysql总和付款

Question

任何人都可以通过一个查询帮助我吗？我有一个看起来像这样的数据库:表费用

paydate       receiver   payment
2011-05-06     SOLO       3000
2011-05-08     Walmart    5000
2011-05-09     McDonalds  400
2011-05-08     Korona     700
2011-05-08     Walmart    1000
2011-05-09     BigZ       1300

我必须计算最高付款完成当天所有付款的总和.结果应如下所示:

paydate       payment
2011-05-08    6700

我设法找到了最高付款额和付款额:

SELECT payment, paydate FROM expenses WHERE payment=(SELECT max(payment) FROM expenses);

但它只给我最大的支付和工资,我需要当天的一笔款项.

Answer 1

将查询更改为:

select sum(payment), paydate
from expenses 
where paydate=(
  select paydate from expenses 
  where payment = (
    select max(payment) from expenses)
);

我在哪里使用过这个SUM功能.

编辑:以前的输出不是所需的.这是我以前和现在使用的sqlfiddle.