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SqlServer nvarchar 空白方框怎么处理？

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SqlServer nvarchar 空白方框怎么处理？

数据是通过其他第三方的软件写进去的，我的工作只是解析出来查看，但是我发现写进去的数据混进去了一些奇怪的东西；
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我以为是空格或空字符串一类的东西，我尝试用 rtrim() 函数进行过滤，但似乎不是我想的那样，没有任何效果，请问大佬们有什么办法解决吗？
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