MS Access：计算名称

Question

如何计算学生姓名并显示所有数据

ID Name      Subject
1  Jack      English
2  Tiffany   English
3  Ben       Mathematics
4  Tiffany   Science
5  Jack      Mathematics

然后输出结果的返回将显示每个人的主题。

ID Name      Subject       [Subject Taken]
1  Jack      English       2
2  Tiffany   English       2
3  Ben       Mathematics   1
4  Tiffany   Science       2
5  Jack      Mathematics   2

Answer 1

你可以通过子查询实现这一点，但不能没有一个组。首先创建一个组，然后将该组与原始表一起加入。

按结果划分的子查询组

Name    CountOfSubject
Ben     1
jack    2
Tiffany 2

-

 SELECT SubQuery.Name, Table1.Subject, SubQuery.CountOfSubject
 FROM 
            ( SELECT Table1.Name, 
                     Count(Table1.Subject) AS CountOfSubject
              FROM Table1
              GROUP BY Table1.Name) AS SubQuery 
 INNER JOIN Table1 ON SubQuery.Name = Table1.Name;

结果

Name    Subject     CountOfSubject
jack    English     2
Tiffany English     2
Ben     Mathematics 1
Tiffany Science     2
jack    Mathematics 2