查询使用COUNT和GROUP BY

Question

1表：员工

+------------+-----------+----------+-----+--------+--------+-------+ 
| EmployeeID | FirstName | LastName | Age | Gender | Salary | JobID | 
+------------+-----------+----------+-----+--------+--------+-------+ 

第二表：JOBTITLE

+-------+----------+----------------+--------+ 
| JobID | JobTitle | JobDescription | Status | 
+-------+----------+----------------+--------+ 

写一个SQL查询来计算所有员工和GROUP BY年龄和性别。 （输出显示化名）

我已经做了以下疑问：

SELECT COUNT(EmployeeID) AS Number_Of_Employees 
FROM Employee 
GROUP BY Age, Gender; 

SELECT COUNT(*) AS 'Total_Employees' 
FROM Employee 
WHERE Gender = 'M' OR Gender= 'F' 
GROUP BY Age, Gender; 

这是两个查询结果：

Answer 1

我想我找到了答案。我结束了运行这个查询，我认为它工作。

SELECT Age, Gender, 
COUNT(EmployeeID) AS Total_Employee 
FROM Employee 
GROUP BY Age, Gender;