Explanation:The $rename operator updates the name of a field. 9.The $rename operator logically performs an _______ of both the old name and the new name.
A. $unset
B. $set
C. $Nested
D. None of the mentioned
Answer:A
Explanation:The $rename operator updates the name of a field. 9.The $rename operator logically performs an _______ of both the old name and the new name.
A. $unset B. $set C. $Nested D. None of the mentioned
Explanation:If the field to rename does not exist in a document, $rename does nothing. 10. ____________ pattern requires additional steps of working with strings and regular expressions.