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並前往https://www.tutorialspoint.com/mongodb-findbyid-returning-a-list-of-documents-instead-of-a-single-result-how-to-get-only-a-single-document

MongoDB findById returning a list of documents instead of a ...

To get only a single result, use findOne() and fetch on the basis of id. Let us create a collection with documents −> db.demo340.

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