Unstructured data means that within a collection there is the possibil

1.	Unstructured data means that within a collection there is the possibility that some fields may not exist for all the documents. How can documents be queried solely based on field availability?
Answer» only those DOCUMENTS that contain the field specified in the query. For the FOLLOWING documents in EMPLOYEE COLLECTION *{ _id: 1, name: "Jonas", linkedInProfile: null }, { _id: 2, name: “WILLIAMS” }* The query { linkedInProfile: { $exists: true } } will return only the employee “Jonas”

Unstructured data means that within a collection there is the possibility that some fields may not exist for all the documents. How can documents be queried solely based on field availability?

Answer»

only those DOCUMENTS that contain the field specified in the query.

{ _id: 1, name: "Jonas", linkedInProfile: null }, { _id: 2, name: “WILLIAMS” }

The query { linkedInProfile: { $exists: true } } will return only the employee “Jonas”