Question

我需要表格：

收入：

| date | incomeAmount |

开支：

| date | expenseAmount |

我想在一个特定月份汇总我所有的收入：MONTH（date）=？

我还需要在同一个月累计所有费用

然后减去以获得当月的利润，输出表类似于：

| Month | TotalIncomes | TotalExpenses | Profit |

如何创建SQL查询才能执行此操作？谢谢你的帮助！

Answer 1

SELECT I.Month AS Month,
       I.TotalIncomes AS TotalIncomes,
       E.TotalExpenses AS TotalExpenses,
       I.TotalIncomes - E.TotalExpenses AS Profit
  FROM ( SELECT EXTRACT(MONTH FROM DATE ) AS Month,
                SUM( I.incomeAmount ) AS TotalIncomes
           FROM Incomes
       )  I,
       (
         SELECT EXTRACT(MONTH FROM DATE ) AS Month,
                SUM( E.expenseAmount ) AS TotalExpenses
           FROM Expenses
       ) E
 WHERE I.Month = E.Month
;

Answer 2

您可以加入汇总表格。

SELECT A.Month, TotalIncomes, TotalExpenses, TotalIncomes-TotalExpenses AS Profit
FROM (MONTH(Date) AS Month, SUM(incomeAmount) AS TotalIncomes
      FROM Incomes 
      GROUP BY MONTH(Date)
      ) A 
INNER JOIN (
      MONTH(Date) AS Month, SUM(expenseAmount) AS TotalExpenses
      FROM Incomes 
      GROUP BY MONTH(Date)
      ) B
 ON A.Month = B.Month

查询计算一个月的利润

2 个答案: