Question

具有简单的查询，例如：

select * from foo

输出中包含列

bar | abc | def
---------------
...............

是否可以将此查询封装到另一个查询中，并给诸如1|2|3...之类的列赋予顺序名称（保持所有行不变）？

我知道这听起来很奇怪，而且可能甚至不可能。

感谢您的帮助！

Answer 1

尝试一下：

DECLARE @TableName NVARCHAR(100) = 'YOUR TABLENAME HERE',
    @Query NVARCHAR(MAX) = 'SELECT '

SELECT @Query = CONCAT(@Query, '    ', COLUMN_NAME, ' AS ', QUOTENAME(ROW_NUMBER() OVER(ORDER BY ORDINAL_POSITION)), ', 
')
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = @TableName

SET @Query = SUBSTRING(@Query, 0, LEN(@Query) - 3) + ' 
FROM ' + QUOTENAME(@TableName)

您使用INFORMATION_SCHEMA.COLUMNS来获取表的所有列， ROW_NUMBER（）窗口函数可为列别名生成顺序号，而sp_ExecuteSQL可执行动态生成的查询。

Answer 2

尝试

DECLARE @Sql NVARCHAR(max),
        @TableName VARCHAR(100) = '<YourTableName>'
;WITH CTE
AS
(
SELECT  DENSE_RANK()OVER (ORDER BY COLUMN_NAME) Rno,
        TABLE_NAME,
        COLUMN_NAME
FROM INFORMATION_SCHEMA.COLUMNS
WHERE  TABLE_CATALOG='Database' 
AND TABLE_NAME =  @TableName
) 
SELECT 'SELECT '+ STUFF((SELECT ', '+ COLUMN_NAME +' AS '+ QUOTENAME(CAST(Rno AS VARCHAR))
FROM CTE
FOR XML PATH ('')),1,1,'') + ' FROM '+@TableName 
PRINT @Sql
EXEC (@Sql)

顺序列名

2 个答案: