mysql - SQL查询来自满足条件的两个表

Question

Table 1 name: Student
Name      Department
Alex         CSE
Bob          EEE
Briyan       ME
John         CSE
James        ETE
Mike         CE

Table 2 name: Program
Department    Semester
   CSE         Summer
   CSE         Winter
   EEE         Summer
   ETE         Summer
   ME          Winter
   CE          Summer
   CE          Winter

打印姓名和学期的 SQL 查询是什么，其中每个学生的部门只有一种类型的学期？ (服务器是mysql)

SQL Query Result should be like this:
Name     Semester
Bob       Summer
Briyan    Winter
James     Summer

在这里，CSE 和 CE 都有夏季和冬季学期。所以亚历克斯、约翰和迈克不包括在内。

到目前为止我已经尝试过了:

SELECT Student.Name,
     Program.Semester
FROM Student
JOIN Program
    ON Program.Department = Student.Department
WHERE ....

Answer 1

您可以在子查询上使用 In 子句，其中计算部门只有一个条目

  select a.Name, b.Departmnet 
  from Student a
  inner join program b on a.Department = b.Department and b.Department In (
  select Department from Program
  group by Department having count(*)=1 
  )