动态SQL = [错误] 42000 - [SQL服务器]附近有语法错误 '01'

Question

这里是我的代码：

DECLARE @1day AS VARCHAR(MAX), @sqlText AS NVARCHAR(MAX), @firstdate AS DATETIME 

SET @firstdate = DATEADD(dd,-(DAY(GETDATE())-1),GETDATE()) 
SET @1day = CONVERT(VARCHAR(MAX), @firstdate, 103) 

SET @sqlText = 'SELECT ' + 'Dummy' + ' AS ' + @1day 

EXEC (@sqlText) 

我收到错误：[错误] 42000 - [SQL服务器]不正确的语法靠近'01'。

预期的结果是：

01/06/2013 
========== 
Dummy 

感谢您的帮助。

Answer 1

你必须附上两个Dummy和@1day用单引号，否则@1day是列别名不正确的语法和Dummy被解释为列名。

有效的SQL：

DECLARE @1day AS VARCHAR(MAX), @sqlText AS NVARCHAR(MAX), @firstdate AS DATETIME 

SET @firstdate = DATEADD(dd,-(DAY(GETDATE())-1),GETDATE()) 
SET @1day = CONVERT(VARCHAR(MAX), @firstdate, 103) 

SET @sqlText = 'SELECT ' + '''Dummy''' + ' AS ''' + CAST(@1day as nvarchar) + '''' 

exec (@sqlText) 

Answer 2

试试这个：

DECLARE @1day VARCHAR(MAX), @sqlText NVARCHAR(MAX), @firstdate DATETIME 

SET @firstdate = DATEADD(dd,-(DAY(GETDATE())-1),GETDATE()) 
SET @1day = CONVERT(VARCHAR(MAX), @firstdate, 103) 

SET @sqlText = 'SELECT ' + '''Dummy''' + ' AS [' + @1day + ']' 

EXEC (@sqlText)