mysql query to get data corresponding to duplicate records

Question

this is a table name test1

id  Roll Rank Grade
1    10   50   A
2    20   60   B
3    30   40   X
4    20   50   A
5    30   90   O
6    10   80   C

want result in following format :

id  Roll   Rank    Grade
1    10   50,80     A,C
2    20   60,80     B,A
3    30   40,90     X,O

Answer 1

This will do the trick:

SELECT id, Roll, GROUP_CONCAT(Rank), GROUP_CONCAT(Grade)
FROM your_table
GROUP BY Roll
HAVING COUNT(*) > 1