如何从SQL结果集中删除空行

Question

我有这样的查询：

SELECT DISTINCT 
    [F_Exhibitor_Name] 
FROM 
    [V_ExhibitorLocation] 
WHERE 
    F_ExhibitionCode ='10996' 
  AND 
    [F_Exhibitor_Name] IS NOT NULL
ORDER BY 
    F_Exhibitor_Name

我的第一行是空白，这会导致代码出错。我当前的结果集如下所示：

Answer 1

在SQL Server中，null和空字符串（''）不相同。如果要排除这两者，则应明确检查两者：

SELECT   DISTINCT [F_Exhibitor_Name]
FROM     [V_ExhibitorLocation] 
WHERE    [F_ExhibitionCode] = '10996' AND
         [F_Exhibitor_Name] IS NOT NULL AND
         [F_Exhibitor_Name] <> ''
ORDER BY [F_Exhibitor_Name]

Answer 2

我可以提出一个混合IS NOT NULL和<> ''的技巧：

SELECT   DISTINCT 
    F_Exhibitor_Name
FROM     
    V_ExhibitorLocation
WHERE    
    F_ExhibitionCode = '10996' 
  AND
    F_Exhibitor_Name > ''   --or ISNULL(F_Exhibitor_Name, '') <> ''
ORDER BY 
    F_Exhibitor_Name