Which of the following command creates an index, where mobile_no is a field in the collection, employees?

All Questions › Category: Data Science › Which of the following command creates an index, where mobile_no is a field in the collection, employees?
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Anonymous asked 4 years ago

Options:

  1. db.SetIndex({“mobile_no”:1})
  2. employees.SetIndex({“mobile_no”:1})
  3. db.employees.ensureIndex({“mobile_no”:1})
  4. db.employees.SetIndex({“mobile_no”:1})
1 Answers
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Anonymous answered 4 years ago

The correct answer is 

  1. db.employees.ensureIndex({“mobile_no”:1})