All aggregate functions except …………… ignore null values in their input collection.

1. Count(attribute)
2. Count(*)
3. Avg
4. Sum

Which of the following is a SQL aggregate function ?

1. LEFT
2. AVG
3. JOIN
4. LEN

The functions which work with individual rows' data are called …………… function.

1. Single row
2. Multiple rows
3. Aggregate
4. None of these

Function count() is a/an …………… function.

1. Single row
2. Multiple rows
3. Aggregate
4. None of these