Explanation:If the variable references an object, to access a specific field in the object, use the dot notation; i.e. “$$.“. 3. Which of the operator is similar to order by clause in RDBMS ?
A. $sort
B. $match
C. $sortby
D. None of the mentioned
Answer:A
Explanation:If the variable references an object, to access a specific field in the object, use the dot notation; i.e. “$$.“. 3. Which of the operator is similar to order by clause in RDBMS ?
A. $sort B. $match C. $sortby D. None of the mentioned
Explanation:In the mongo shell, when you assign the cursor returned from the find() method to a variable using the var keyword, the cursor does not automatically iterate. 4. Which of the following provides similar functionality to join ?