使用动态查询SQL Server中的变量

Question

我试图从该查询要做的就是我试图让所有超过指定Cutoffnumber年长从customertransaction表中的行：

@Cutoffnumber INT 

SELECT @SQL = 'SELECT * FROM customertransaction WHERE DATEDIFF(DD, Transactiondate, GETDATE()) > @Cutoffnumber ' 

但是我得到下面的错误，请注意，这是一个动态的SQL查询。

必须声明标量变量 “@Cutoffnumber”

我应该如何着手。

Answer 1

查找到sp_executesql

Answer 2

Decalre @Cutoffnumber INT  
Set @Cutoffnumber = @someValue 
SELECT @SQL = 'SELECT * FROM customertransaction WHERE DATEDIFF(DD, Transactiondate, GETDATE()) >' + @Cutoffnumber 

虽然好像你能做到这一点不存在动态SQL：

Declare @Cutoffnumber INT  
Set @Cutoffnumber = @someValue 
SELECT * FROM customertransaction WHERE DATEDIFF(DD, Transactiondate, GETDATE()) > @Cutoffnumber