Oracle query and aggregate function

Question

I have table name employee_1 suppose in oracle. If the mobile_no and sim_no is same i want select maximum start_date. I have tried , but no success. Please help The employee_1 t

Answer 1

Try this, hopefully, it fulfills your requirement.

select mobile_no,sim_no,start_date,end_date from(
select mobile_no,sim_no,start_date,end_date,rank() over(partition by mobile_no,sim_no order by start_date desc) rn from employee_1)s
where rn=1