Comparison expressions return a boolean except for ________ which returns a number.
A. $copy
B. $cmp
C. $num
D. None of the mentioned
Answer:A
Comparison expressions return a boolean except for ________ which returns a number.
A. $copy B. $cmp C. $num D. None of the mentioned
Explanation:The $cmp compares both value and type, using the specified BSON comparison order for values of different types. 2. Point out the correct statement :