Which of the following is incorrect statement about find and findOne operations in MongoDB?

Question

Options

• AfindQ returns all the documents in a collection while findOne() retrieves only the first one.
• Bfind.limit(l) is not the same query as findOne()
• CfindOneQ returns the actual first document retrieved from a collection
• DfindQ and findOneQ returns cursors to the collection documents

• A
  6% (3)
• B
  2% (1)
• C
  2% (1)
• D
  90% (45)

Explanation

D is incorrect because findOne() does not return a cursor - it returns the actual document object directly (or null if nothing matches). Only find() returns a cursor, so claiming both return cursors is the false statement.

Why A, B, and C are correct (and therefore not the answer):

• A is true: find() retrieves all matching documents via a cursor, while findOne() stops at the first match.
• B is true: find().limit(1) still returns a cursor (you must iterate it), whereas findOne() returns the document itself - different behavior, not equivalent.
• C is true: findOne() hands back the raw document object, not a cursor, which is precisely what makes D false.

Memory tip: Think of find() as handing you a pointer to a shelf (cursor - you browse it yourself), while findOne() hands you the book directly. If both gave you a pointer, there'd be no reason for findOne() to exist.

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