TASK 2: Airline flight information Using domain and tuple relational calculus, find: 1. Find the eids of pilots certified for some Boeing aircraft. 2. Find the names of pilots certified for some Boeing aircraft. 3. Find the aids of all aircraft that can be used on non-stop flights from Paris to Vancouver. 4. Find the names of pilots who can operate planes with a range greater than 3,000 miles but are not certified on any Boeing aircraft. 5. Find the eids of employees who make the highest salary (multiple employees can have highest salary). Relation Flights Aircraft Certified Relational schema FLIGHTS(flno, from, to, distance, departs, arrives) AIRCRAFT (aid, aname, cruisingrange) CERTIFIED (#eid, #aid) Employees EMPLOYEES(eid, ename, salary)

Using a graphics program, develop an entity-relationship diagram for a database application for an Internet bookstore where students buy textbooks from a salesperson and receive invoices for their purchases. Use Figure 5.5 as a guide.

Create the ERD. (Hint: Look at the table contents. You will discover that an AIRCRAFT can fly many CHARTER trips but that each CHARTER trip is flown by one AIRCRAFT, that a MODEL references many AIRCRAFT but that each AIRCRAFT references a single MODEL, and so on.)

Access path A database table is composed of records and fields hold data. Data is stored in records. A field is a part of a record and contains a single piece of data for the subject of the record. The access path for finding the list of books is AUTHOR: AuthorID, Lname BOOKAUTHOR: AuthorID, ISBN BOOKS: Pubdate, ISBN