Use the line of code below to choose the correct answer. This code is an example of a(n): while (count < 7): print ‘Great!’

infinite loop.
pass statement.
for loop.
single statement suite.

In the context of it jobs in the information systems field. a is responsible for database design and implementation

The narrative structure of the popular movies can be broken down into

Suppose there is a relation r(a, b, c) with a b+-tree index with search keys (a, b).1. what is the worst-case cost of finding records satisfying 10 < a < 50 using this index, in terms of the number of records n1, retrieved and the height h of the tree? 2. what is the worst-case cost of finding records satisfying 10 < a < 50 and 5 < b < 10 using this index, in terms of the number of records n2 that satisfy this selection, as well as n1 and h defined above? 3. under what conditions on n1 and n2, would the index be an efficient way of finding records satisfying the condition from part (2)?