Writing SQL query for getting maximum occurrence of a value in a column

Question

I have an emp table with the records below:

INSERT into emp(EmpId,Emp name, Manager)
Values(1,A,M1)
values(2,B,M1)
values(3,C,M2)
values(4,D,M3)         


        

Answer 1

If you want the row from the emp table, use this:

select * from emp
where empid in (select manager from 
    (select manager, count(*)
     from emp
     group by 1
     having count(*) = (select max(count) from (select manager, count(*) as count from emp group by 1) x)
    ) y );

This will also return multiple rows in case there is a tie for the most number of employees.