What is odbc? how is it related to sql/cli? 10.2. what is jdbc? is it an example of embedded sql or of using function calls? 10.3. list the three main approaches to database programming. what are the advantages and disadvantages of each approach? 10.4. what is the impedance mismatch problem? which of the three programming approaches minimizes this problem? 10.5. describe the concept of a cursor and how it is used in embedded sql. 10.6. what is sqlj used for? describe the two types of iterators available in sqlj

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)?