Question

请帮我查询ms-access

我必须前往表格：

Table A:
Prim_key For_key Total
1       ID1     10
2       ID1     20
3       ID2     30
4       ID2     10
Table B:
Prim_key For_key Total
1        ID1      20
2        ID1       5
3        ID2      20
4        ID2      10

我需要选择并显示表A和B中的For_key和Sum总计字段并减去总和，如下所示

For Key Total_A Total_B Substract
ID1     30       25      5
ID2     40       30      10

Sory因为我的英语不好。谢谢你的帮助

Answer 1

您可以使用带有UNION ALL的子查询来确保您还获得仅存在于两个表之一中的ID值：

SELECT   For_key, 
         SUM(TotalA) AS Total_A, 
         SUM(TotalB) AS Total_B,
         SUM(TotalA)-SUM(TotalB) AS Subtract 
FROM     (
            SELECT  For_key, Total AS TotalA, 0 AS TotalB 
            FROM A
            UNION ALL
            SELECT  For_key, 0, Total
            FROM B
         ) AS C
GROUP BY For_key

从2个不同的表中查询总和和组

1 个答案: