如何在SQL中选择MAX和另一列

Question

假设我有以下表格

Name    Firm   Salary
Aron    X      100
Bill    X      200
Clint   Y      300

我想找到拥有最多员工数量并产生结果的公司

Firm    Total
X       2

然而，这是我的问题，以下查询永远不会在MySQL中运行

select firm,max(Number_Of_Employees) as Total from
(select firm,count(*) as Number_Of_Employees from works group by firm)
as temp;