查詢使用COUNT和GROUP BY

Question

1表：員工

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

第二表：JOBTITLE

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

寫一個SQL查詢來計算所有員工和GROUP BY年齡和性別。 （輸出顯示化名）

我已經做了以下疑問：

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; 

這是兩個查詢結果：

Answer 1

我想我找到了答案。我結束了運行這個查詢，我認爲它工作。

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