在mysql中，如何查找重複所有字段的行？

Question

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

我如何獲得對這兩個字段重複的行？
在此先感謝。

Answer 1

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

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

Answer 2

它應該是這樣的

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

Answer 3

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