必须声明标量变量@T解决方法

必须声明标量变量@T
有以下代码在Ctrl+F5时老是提示‘必须声明标量变量@T’，麻烦帮看下到底是哪里错了

SQL code

declare @Sql nvarchar(500)declare @SysOrderNo intdeclare @ShortName varchar(30),@Spec varchar(30),@Spec1 varchar(30),@Spec2 varchar(30),@Spec3 varchar(30),@Spec4 varchar(30)declare @DataBaseName varchar(30)declare @T table (Row        int identity(1,1)    not null,    ShortName varchar(30)        null,    Spec    varchar(30)            null,    Spec1    varchar(30)            null,    Spec2    varchar(30)            null,    Spec3    varchar(30)            null,    Spec4    varchar(30)            null,    primary key (Row))Set @DataBaseName='FYData'Set @SysOrderNo=5Set @Sql='insert into @T Select ShortName,Spec,Spec1,Spec2,Spec3,Spec4 From '+@DataBaseName+'.dbo.ORDERDETAIL '+' Where SysOrderNo='+cast(@SysOrderNo as varchar(10))exec sp_executesql @Sql,N'@ShortName varchar(30) output,@Spec varchar(30) output,@Spec1 varchar(30) output,@Spec2 varchar(30) output,@Spec3 varchar(30) output,@Spec4 varchar(30) output,@T table output',@ShortName output,@Spec output,@Spec1 output,@Spec2 output,@Spec3 output,@Spec4 output,@T outputSelect * From @T

SQL code

declare @Sql nvarchar(500)declare @SysOrderNo intdeclare @ShortName varchar(30),@Spec varchar(30),@Spec1 varchar(30),@Spec2 varchar(30),@Spec3 varchar(30),@Spec4 varchar(30)declare @DataBaseName varchar(30)declare @T table (Row        int identity(1,1)    not null,    ShortName varchar(30)        null,    Spec    varchar(30)            null,    Spec1    varchar(30)            null,    Spec2    varchar(30)            null,    Spec3    varchar(30)            null,    Spec4    varchar(30)            null,    primary key (Row))Set @DataBaseName='FYData'Set @SysOrderNo=5Set @Sql=N'Select ShortName,Spec,Spec1,Spec2,Spec3,Spec4 From ['+@DataBaseName+'].dbo.ORDERDETAIL Where SysOrderNo='''+cast(@SysOrderNo as varchar(10))+''' 'insert into @T exec sp_executesql @SqlSelect * From @T