通过将此类测试与新的nvarchar (max)表示法相结合，它可以限制输入字数。
Just pass an integer value to the function within your SQL code and it will be implicitly cast to an nvarchar and the appropriate group will be returned.
仅将整数值传递给SQL代码中的函数，它会隐式地转换为nvarchar并且返回相应的组。
Arithmetic overflow error converting nvarchar to data type numeric.
