Explanation:Expressions can be nested. 3. Aggregation expressions use ______ path to access fields in the input documents.
A. mpath
B. dbpath
C. lpath
D. field
Answer:A
Explanation:Expressions can be nested. 3. Aggregation expressions use ______ path to access fields in the input documents.
A. mpath B. dbpath C. lpath D. field
Explanation:To specify a field path, use a string that prefixes with a dollar sign $ the field name or the dotted field name, if the field is in embedded document. 4. Which of the following statement is equivalent to “$$CURRENT.” ?