Explanation:$meta returns the metadata associated with a document in a pipeline operations. 7. Which of the following accepts named parameters ?
A. $reduce
B. $letnum
C. $let
D. None of the mentioned
Answer:A
Explanation:$meta returns the metadata associated with a document in a pipeline operations. 7. Which of the following accepts named parameters ?
A. $reduce B. $letnum C. $let D. None of the mentioned
Explanation:$let defines variables for use within the scope of a subexpression and returns the result of the subexpression. 8. _______ returns the number of elements in the array.