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Database: Does KEY for an instance makes sense, what are the benefit of it?

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Database: Does KEY for an instance makes sense, what are the benefit of it?
posted Apr 8, 2018 by anonymous

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+1 vote

Query description: I have a collection name student_db and added a document in a collection with entries (name: "alok, age : 31 and profession: "xyz"). After inserting the document into student_db database, I want to add another (key:value ) pair i.e. salary: 50000.

Can someone help me out to resolve this problem ?

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