Aggregate functions are functions that take a ___________ as input and return a single value.
A. Collection of values
B. Single value
C. Double value
D. All of the mentioned
Answer:A
Aggregate functions are functions that take a ___________ as input and return a single value.
A. Collection of values B. Single value C. Double value D. All of the mentioned
Explanation:Aggregate functions perform a calculation on a set of values. 2. SQL applies predicates in the _______ clause after groups have been formed, so aggregate functions may be used.