Sql server 使用计数和分组依据进行查询

第一张表：员工

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

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

第二张表：职务

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

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

编写一个SQL查询，按年龄和性别统计所有员工和分组。（输出显示别名）

我已经完成了以下查询：

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;

这是两个查询的结果：

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我想我找到了答案。我最终运行了这个查询，我认为它是有效的

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

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那么，问题是什么？我在发布我的问题后发现了。它将提出一个查询，按年龄和性别统计所有员工和群体。