Aggregate functions are functions that take a ___________ as input and return a single value.
SQL applies predicates in the _______ clause after groups have been formed, so aggregate functions may be used.
The ________ keyword is used to access attributes of preceding tables or subqueries in the from clause.
Which of the following is not a aggregate function ?
If we do want to eliminate duplicates, we use the keyword __________in the aggregate expression.
All aggregate functions except __________ ignore null values in their input collection.
A Boolean data type that can take values true, false, and ____________
The phrase “greater than at least one” is represented in SQL by ___________
We can test for the nonexistence of tuples in a subquery by using the __________ construct.
Which of the following is a set function ?