Question

我有这样的查询：

SELECT distinct [F_Exhibitor_Name],
       F_Site 
  FROM [V_ExhibitorLocation] 
 WHERE F_ExhibitionCode ='10996' is not null 
 ORDER BY F_Exhibitor_Name

但显示错误

关键字'is'
附近的语法不正确

Answer 1

您必须删除is not null，如下所示

SELECT distinct [F_Exhibitor_Name],F_Site 
FROM [V_ExhibitorLocation] 
Where F_ExhibitionCode ='10996' 
order by F_Exhibitor_Name

或使用不能为空的字段添加条件，如下所示

SELECT distinct [F_Exhibitor_Name],F_Site 
FROM [V_ExhibitorLocation] 
Where F_ExhibitionCode ='10996' 
and  [column]   is not null 
order by F_Exhibitor_Name

Answer 2

以下布尔条件无论您解析它的方式都无效：

 WHERE F_ExhibitionCode ='10996' is not null

据推测，你只想要：

 WHERE F_ExhibitionCode = '10996'

这相当于：

 WHERE F_ExhibitionCode = '10996' AND F_ExhibitionCode IS NOT NULL

从查询中排除NULL时接收错误

2 个答案: