在mysql中，如何找到相對於所有字段重復的行？

Question

+------------+------------+
| student    | department |
+------------+------------+
| 1234567890 | CS         | 
| 1234567890 | ME         | 
| 1234567890 | CS         | 
| 000000001  | ME         | 
+------------+------------+

如何獲得相對於兩個字段重復的行？
提前致謝。

Answer 1

應該是這樣的

SELECT  student,
    department      
FROM    Table
GROUP BY student, department
HAVING COUNT(*) > 1

Answer 2

SELECT student, department, count(*) as 'count' 
FROM students
GROUP BY student, department
HAVING count > 1

+------------+------------+-------+
| student    | department | count |
+------------+------------+-------+
| 1234567890 | CS         | 2     |
+------------+------------+-------+

Answer 3

SELECT * 
FROM mytable
GROUP BY student, department
HAVING COUNT( * ) > 1;