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How does the website determine whether the data is duplicate when uploading it?

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Release： 2016-07-25 08:59:32
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①For example, on a library website, how to prevent users from repeatedly uploading the same documents? Should MD5 be used for comparison? Is there any other way?
② If you only change the name of the document without changing the content, will the MD5 be the same before and after the change?


Related labels：
上传资料时网站怎么判断是否是重复资料 ？
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