如果Else不在TSQL中工作

Question

如果永远不会奏效。总是陷入其他条件。我已调试并检查@nextapprover不为空。

IF (@nextApprover != NULL)
BEGIN
    UPDATE CallWatching
    SET EmployeeNo = @employeeNo
    WHERE @SRFID = MasterCode;

    INSERT INTO CallForwarding (
        MasterCode
        ,EmployeeNo
        ,ApproverNo
        ,IsForwarded
        ,ForwardBy
        )
    VALUES (
        @SRFID
        ,@EmployeeNo
        ,@nextApprover
        ,0
        ,@EmployeeNo
        )
END
ELSE
BEGIN
    UPDATE CallWatching
    SET STATUS = 1
    WHERE @SRFID = MasterCode;
END

Answer 1

使用IS NOT NULL

即。变更：if(@nextApprover!=null) 到IF(@nextApprover IS NOT NULL)

此外，您应该<>而不是!=，因为它符合ANSI标准