Question

我有陈述A和陈述B.

语句A返回5条记录，语句B返回1条记录。

声明A

    SELECT DISTINCT    
    Outlet.cCode,
    Employee.cEmployeeNumber,
    FROM  Outlet 
    INNER JOIN Employee ON EmployeeOutlet.iEmployee = Employee.iID 
    WHERE cCOde = 123

声明B

 Select OutletCode, RSMcode, ASMcode, FMcode from Employee_Hierarchy
 Where OutletCode = 123

现在，只有3个来自Statement A的记录必须与Employee一起返回.cmployeeNumber等于RSMcode，ASMcode或FMcode ......

现在如果我在其中添加以下JOIN将只返回1条记录，我如何迎合仍然需要的其他2条呢？

 SELECT DISTINCT    
        Outlet.cCode,
        Employee.cEmployeeNumber,
        FROM  Outlet 
        INNER JOIN Employee ON EmployeeOutlet.iEmployee = Employee.iID 
        INNER JOIN Employee_Hierarchy as EH ON EH.RSMcode = Employee.cEmployeeNumber and EH.OutletCode = Outlet.cCode
        WHERE Outlet.cCode = 123

当我为每个RSMcode和ASMcode和FMcode添加一个JOIN时，它什么都不返回.....

Answer 1

这是怎么回事？

SELECT DISTINCT    
    Outlet.cCode,
    Employee.cEmployeeNumber,
    FROM  Outlet 
    INNER JOIN Employee ON EmployeeOutlet.iEmployee = Employee.iID 
    INNER JOIN Employee_Hierarchy as EH ON EH.OutletCode = Outlet.cCode AND (EH.RSMcode = Employee.cEmployeeNumber OR EH.ASMcode = Employee.cEmployeeNumber OR EH.FMcode = Employee.cEmployeeNumber)
WHERE Outlet.cCode = 123

Answer 2

只是一个猜测

SELECT DISTINCT    
        Outlet.cCode,
        Employee.cEmployeeNumber,
        FROM  Outlet 
        INNER JOIN Employee ON EmployeeOutlet.iEmployee = Employee.iID 
        INNER JOIN Employee_Hierarchy as EH ON EH.RSMcode = Employee.cEmployeeNumber and EH.OutletCode = Outlet.cCode
        and EH.OutletCode = 123

Answer 3

INNER JOIN Employee_Hierarchy as EH ON EH.RSMcode = Employee.cEmployeeNumber and outletCode = Outlet.cCode

将此段代码更改为

INNER JOIN Employee_Hierarchy as EH ON EH.OutletCode = Outlet.cCode 
WHERE 
Employee.cEmployeeNumber=EH.RSMcode OR 
Employee.cEmployeeNumber=EH.ASMcode OR
Employee.cEmployeeNumber=EH.FMcode

使用TSQL JOIN返回正确的记录

3 个答案: