將2條SQL語句合併爲1

Question

我想要選擇比他們的經理賺得更多的員工。我有我在下面寫的這些SQL語句，但我怎樣才能將這些語句合併爲一個語句？

SELECT E.Salary 
FROM Employee E 
WHERE E.ManagerId = E.Id 

SELECT * 
FROM Employee M 
WHERE M.Salary > E.Salary AND M.ManagerId != M.Id 

Answer 1

，你可以使用自內連接

SELECT E.* 
FROM Employee E 
INNER JOIN Employee M ON E.ManagerId = M.Id 
WHERE E.Salary > M.Salary 

Answer 2

閱讀關於加盟，爲您的示例：

SELECT E.* 
FROM Employee E 
    JOIN Employee M ON E.ManagerId = M.Id 
WHERE E.Salary>M.Salary; 

Answer 3

SELECT E.Salary, M.* 
FROM Employee E 
inner join Mamanger M on E.ManagerId = M.Id and E.Salary > M.Salary