13-至少有5名直接下属的经理

select 
    name
from 
    Employee 
where id in (
    select 
        managerId  -- 查找大于5的经理id
    from 
        Employee
    group by 
        managerId  -- 根据id分组
    having 
        count(*)>=5); -- 根据分组的数据进行求个数