最喜欢的课程查询

Question

我不知道我会怎么做：

我有三个表：

Student(StudentID, StudentName) 
Course(CourseID, CourseName) 
StudentCourse(StudentID, CourseID) -- junction table to assign courses to students 

我将如何查询来获取基础上，在最喜欢的课程条件 即“入学人数最多的课程是 最喜欢的课程”

帮助??

我已经安装的模式在SQL小提琴

SQLFiddle

Answer 1

SELECT TOP 1 WITH TIES COURSEID 
FROM STUDENTCOURSE 
GROUP BY COURSEID 
ORDER BY Count(*) DESC 

Answer 2

使用TOP...WITH TIES

SELECT TOP 1 WITH TIES c.CourseName, 
     COUNT(c.CourseID) totalCount 
FROM student a 
     INNER JOIN studentcourse b 
      ON a.studentID = b.studentID 
     INNER JOIN course c 
      ON b.courseID = c.courseID 
GROUP BY c.CourseName 
ORDER BY totalCount DESC 

WITH TIES尝试它表明，拥有数相同数量的最高记录。

SQLFiddle Demo