更改此存储过程以避免使用 CROSS APPLY？

Question

我试图在不同的列中显示老板和他们负责的员工的名字。

我可以通过交叉应用来完成，但我被要求在不使用它的情况下进行，但我真的想不出该怎么做。

我正在为 SQL 服务器使用 Northwind 数据库，这是我的代码：

CREATE PROCEDURE sp_getBossAndEmployeeNames
    @bossID NCHAR(5)
AS
    CREATE TABLE #TEMP_BOSSES_AND_EMPLOYEES
    (
        BossFullName VARCHAR(35), 
        EmployeeFullName VARCHAR(35)
    )

    INSERT INTO #TEMP_BOSSES_AND_EMPLOYEES
    SELECT (FirstName + ' ' + LastName) as BossFullName, sub.EmployeeFullName 
    FROM Employees 
    CROSS APPLY 
    (
        SELECT (FirstName + ' ' + LastName) as EmployeeFullName FROM Employees WHERE ReportsTo = @bossID 
    ) AS sub
    WHERE EmployeeID = @bossID 

    SELECT * FROM #TEMP_BOSSES_AND_EMPLOYEES

Answer 1

只需使用 INNER JOIN:

SELECT B.FirstName + ' ' + B.LastName AS BossFullName
    , E.FirstName + ' ' + E.LastName AS EmployeeFullName
FROM dbo.Employees B
INNER JOIN dbo.Employees E ON E.ReportsTo = B.id
WHERE B.EmployeeID = @bossID;

据我所知，你甚至不需要临时 table。

更改此存储过程以避免使用 CROSS APPLY？

Change this stored procedure to avoid using CROSS APPLY?

sql-server

stored-procedures

northwind