两个不同的表日期列应该相同，金额列应该不同，如何计算每月的支出金额？

Question

SELECT month(date), SUM(amount) as amount
FROM expendituretotal
GROUP BY month(date);

我想要这样的输出：

month    amount1   amount2
---------------------------
June       2000      3000

Answer 1

正确答案。

SELECT e.month
    ,e.expp AS amount
    ,e1.depp AS amount
FROM (
     SELECT month(DATE) AS month
           ,SUM(amount) AS expp
     FROM expendituretotal
     GROUP BY month(DATE)
     ) e
    ,(
    SELECT month(DATE) AS month
          ,SUM(amount) AS depp
    FROM totalamount
    GROUP BY month(DATE)
    ) e1
WHERE e.month = e1.month