What is Frequency?

Suppose list list1 is [1, 2, 5] and list list2 is [2, 3, 6]. After list1.addAll(list2), list1 is __________.

a. [1, 2, 2, 3, 5, 6] b. [1, 2, 3, 5, 6] c. [1, 5] d. [2]

In what normal form is the LOTS relation schema in Figure 15.12(a) with respect to the restrictive interpretations of normal form that take only the primary key into account? Would it be in the same normal form if the general definitions of normal form were used?

What will be an ideal response?