用于查找每个用户的计数的 SQL

Question

假设我有下表:

Student      Course           University
1             a                   x
1             b                   x
1             c                   x
1             a                   y
2             a                   x
2             a                   y
2             a                   z
3             a                   x

对于每个学生，我试图找到他们注册的独特类(class)和大学的数量。

输出如下:

Student     No. of Courses        No. of Universities
 1             3                         2
 2             1                         3
 3             1                         1

我将如何为此构建 SQL？

Answer 1

SELECT Student,
       COUNT(DISTINCT Course)     AS NumberOfCourses,
       COUNT(DISTINCT University) AS NumberOfUniversities
FROM   YourTable
GROUP  BY Student