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Home / Interview Subjects / MongoDB
WithoutBook LIVE Mock Interviews MongoDB Related interview subjects: 24

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Ques 4

What is a NoSQL database?

NoSQL databases are databases that provide a mechanism for storage and retrieval of data that is modeled in ways other than the tabular relations used in relational databases.
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Ques 6

What is the significance of the ObjectId in MongoDB?

ObjectId is a 12-byte identifier typically employed as the primary key in a MongoDB document. It consists of a timestamp, machine identifier, process ID, and a random incrementing value.
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Ques 7

What is the purpose of the `findOne` method in MongoDB?

The `findOne` method in MongoDB is used to retrieve a single document that satisfies the specified query criteria. It returns the first document that matches the query.
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