检查表中是否存在表

Question

如何使用SQL查询检查表中是否存在列？我使用Access 2007年。

Answer 1

可以使用Information_schema观点：

If Not Exists (Select Column_Name 
       From INFORMATION_SCHEMA.COLUMNS 
       Where Table_Name = 'YourTable' 
       And Column_Name = 'YourColumn') 
begin 

-- Column doesn't exist 

end 

此外，您可能希望通过包括数据库和/或模式进一步限制where条款。

If Not Exists (Select Column_Name 
       From INFORMATION_SCHEMA.COLUMNS 
       Where Table_Name = 'YourTable' 
       And Column_Name = 'YourColumn' 
       And Table_Catalog = 'YourDatabaseName' 
       And Table_Schema = 'YourSchemaName') 

begin 

-- Column doesn't exist 

end 

Answer 2

if Exists(select * from sys.columns where Name = N'columnName' 
      and Object_ID = Object_ID(N'tableName')) 

begin 

    -- Column Exists 

end 

"REFERENCE"

Answer 3

IF NOT EXISTS (SELECT 1 
FROM syscolumns sc 
JOIN sysobjects so 
ON sc.id = so.id 
WHERE so.Name = 'TableName' 
AND sc.Name = 'ColumnName') 
BEGIN 
--- do your stuff 
END