Calculations With NULL

Question

Which of these statements about calculations with NULL are true? Choose all that apply.

Answer 1

10 + NULL raises an error, because NULL is not a number

Answer 2

The number of days between a rental date and a NULL return date is NULL

Answer 3

5 * NULL gives NULL

Answer 4

10 + NULL gives 10, because NULL counts as zero

Answer 5

10 + NULL gives NULL

Answer 6

5 * NULL gives 0