When a field is declared static there will be group of answer choices two reference copies of the field for each method in the class a copy of the field in each class object a copy of the field for each method in the class only one copy of the field in memory

The qwerty keyboard is the most common layout of keys on a keyboard

Negative methods of behavior correction include all but this: sarcasm verbal abuse setting an example for proper behavior humiliation

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)?