mysql - 动态 SQL = [Err] 42000 - [SQL Server]“01”附近的语法不正确

Question

这是我的代码：

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)

我收到错误消息：[Err] 42000 - [SQL Server]'01' 附近的语法不正确。

预期结果是：

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

感谢帮助。

Answer 1

您必须用单引号括起来Dummy，否则列别名的语法不正确，并被解释为列名。@1day@1dayDummy

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

尝试这个 ：

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)