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

In Postgresql, create schema Test:

create table Test.Employee (Emp_id numeric, manager_id numeric, Manager_name varchar(20));

insert into Test.Employee(emp_id, manager_id, manager_name ) values(1, 3, 'A'),  (2, 3, 'A'), (3, 3, 'A'), (4, 3, 'A'), (5, 11, 'B'), (6, 12, 'C'), (7, 11, 'B');

select manager_name from (select count(manager_id) as mcount, manager_name from test.employee group by manager_name order by mcount DESC) AS TEMP limit 1