insert into student_id values ('w1', 'c2', '2022-04-03')
insert into student_id values ('w1', 'c3', '2022-04-04')
insert into student_id values ('w1', 'c4', '2022-05-01')
insert into student_id values ('w2', 'c1', '2022-05-01')
insert into student_id values ('w2', 'c2', '2022-05-04')
insert into student_id values ('w3', 'c4', '2022-05-05')
insert into student_id values ('w3', 'c6', '2022-06-03)
insert into student_id values ('w3', 'c7', '2022-06-05')
insert into student_id values ('w3', 'c8', '2022-06-07')
expected output:
-------------------
months count_wallet_id
2022-04 1
2022-05 2
2022-05 0
Regards
A.Rama Krishnan