Question

Aggregation pipeline was introduced in MongoDB version ______

(a) 2.1

(b) 2.2

(c) 2.4

(d) 3.0

I have been asked this question by my school principal while I was bunking the class.

This key question is from Aggregation Pipeline in division Aggregation Concepts and Aggregation Mechanics of MongoDB

Answer 1

Right choice is (b) 2.2

The explanation is: The aggregation pipeline provides an alternative to map-reduce.