Objective c 您使用的是SQL Server的N？我已经编辑了问题。对于简单的查询，您可以推荐乔@ C提供的答案。请考虑将乔C的答案标记为“接受”（大“嘀嗒符号”）。在他的问题旁边，请考虑将乔C的答案标记为“接受”（大“滴答符号”）。 SET ANSI_NULLS ON

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您使用的是SQL Server的N？我已经编辑了问题。对于简单的查询，您可以推荐乔@ C提供的答案。请考虑将乔C的答案标记为“接受”（大“嘀嗒符号”）。在他的问题旁边，请考虑将乔C的答案标记为“接受”（大“滴答符号”）。

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================            
-- Author:  <Author,,Name>            
-- ALTER date: <ALTER Date,,>            
-- Description: <Description,,>            
-- =============================================            
ALTER PROCEDURE [dbo].[_spGetEmpList]                  
 @strComCode as varchar(50),
 @iDepID as INT,
 @strType AS varchar(20)

AS            
BEGIN            
 DECLARE @bNameOrder as bit  

 SET NOCOUNT ON;  
 SELECT  @bNameOrder = dbo.svnGetSetupOption(@iDepID,
                                            'LastNamePreceedsFirstName',
                                            @strComCode)
 IF ( @bNameOrder IS NULL )
    SET @bNameOrder = 0

IF(@strType = 'Emp')
BEGIN

    --0**************************************            
     SELECT EmpID AS ResourceID, EmpNumber          
     FROM Emuloyeetbl
        WHERE Emuloyeetbl.IsActive = 1 AND DepID = @iDepID  
     ORDER BY EmpFName

     --1**************************************
     SELECT DepartmentName
     FROM tblDepartment
     WHERE IsActive = 1

     --2**************************************
     SELECT OptionValue AS EmpRole
     FROM EmpRole
     WHERE OptionName = 'EmployeeRole' AND DepID = @iDepID AND IsActive = 1

     --3**************************************

    Select EmployeeFirstName + ' '+EmplouyeeLastName as EmpName 
    from EmpTable
    Where DepID = @iDepID AND EmpSalary < 10
END           

END

    Create Table #EmpTable (EmployeeFirstName Varchar(8000), EmployeeLastName Varchar(8000), EmpSalary Decimal(15,2))
    Insert #EmpTable Values ('Jill', 'Jacobs', 20000)
    Insert #EmpTable Values ('Joe', 'Johnson', 60000)

If Exists(Select null from #EmpTable Where EmpSalary < @Filter)
        Select EmployeeFirstName + ' '+EmployeeLastName as EmpName from #EmpTable Where EmpSalary < @Filter
        Else
        Select '' as EmpName 


-- If looking for less than 10 a blank row is returned.    
    Declare @Filter Decimal = 10
    If Exists(Select null from #EmpTable Where EmpSalary < @Filter)
    Select EmployeeFirstName + ' '+EmployeeLastName as EmpName from #EmpTable Where EmpSalary < @Filter
    Else
    Select '' as EmpName 

-- This returns the record for Jill Jacobs    
   Declare @Filter Decimal = 30000
   If Exists(Select null from #EmpTable Where EmpSalary < @Filter)
   Select EmployeeFirstName + ' '+EmployeeLastName as EmpName from #EmpTable Where EmpSalary < @Filter
   Else
   Select '' as EmpName 

CREATE TABLE EmpTable( EmployeeFirstName VARCHAR( 10 ), EmplouyeeLastName VARCHAR( 10 ), EmpSalary INT )
INSERT INTO EmpTable
VALUES
( 'John', 'Smith', 9 ),
( 'Bob', 'Smith', 11 )

DECLARE @MaxSalary INT
SET @MaxSalary = 7

;WITH EmpTable2 (EmpName)
AS
(
    SELECT EmployeeFirstName + ' '+EmplouyeeLastName as EmpName
    FROM EmpTable
    WHERE EmpSalary < @MaxSalary
)
SELECT *
FROM EmpTable2
/* Add Dummy row when no records have been returned by CTE */
UNION ALL
SELECT 'None' AS EmpName
WHERE NOT EXISTS( SELECT * FROM EmpTable2 )

SELECT EmpName
FROM
    ( SELECT EmpName, COUNT(*) OVER() AS Cnt
    FROM
        ( SELECT EmployeeFirstName + ' ' + EmplouyeeLastName AS EmpName
        FROM EmpTable
        WHERE EmpSalary < @MaxSalary
        UNION ALL
        SELECT 'None' AS EmpName
         ) AS a
    ) AS b
WHERE ( Cnt > 1 AND EmpName != 'None' ) OR Cnt = 1

IF EXISTS( Select EmployeeFirstName + ' '+EmplouyeeLastName as EmpName 
    from EmpTable
    Where DepID = @iDepID AND EmpSalary < 10)
     BEGIN
         Select EmployeeFirstName + ' '+EmplouyeeLastName as EmpName 
         from EmpTable
         Where DepID = @iDepID AND EmpSalary < 10
        ORDER BY EmpName
     END
     ELSE
     BEGIN
        SELECT '' AS EmpName
     END