select stud_id , group_concat(paper_id) as i from tb
group by id

Original Table:
stud_id paper_id
1 1
1 2
1 3
1 4
2 2
2 3
3 1
4 2

Output:
stud_id paper_id
1 1,2,3,4
2 2,3
3 1
4 2

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