Which of the following statements are true?
a. Generic type information is present at compile time.
b. Generic type information is not present at runtime.
c. You cannot create an instance using a generic class type parameter.
d. You cannot create an array using a generic class type parameter.
e. You cannot create an array using a generic class.
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The condition expression1 && expression2 evaluates to true when .
a) expression1 is true and expression2 is false b) expression1 is false and expression2 is true c) both expression1 and expression2 are true d) both expression1 and expression2 are false
Formulate the following queries in relational algebra, tuple relational calculus, and domain relational calculus (the answers to these queries in SQL are given in the next section).
The following tables form part of a database held in a Relational Database Management System: Employee (empNo, eName, salary, position) Aircraft (aircraftNo, aName, aModel, flyingRange) Flight (flightNo, from, to, flightDistance, departTime, arriveTime) Certified (empNo, aircraftNo) where Employee contains details of all employees (pilots and non-pilots) and empNo is the key. AirCraft contains details of aircraft and aircraftNo is the key. Flight contains details of the flights and flightNo is the key. and Certified contains details of the staff who are certified to fly an aircraft, and empNo/aircraftNo form the key. (1) List all Boeing aircraft. (2) List all Boeing 737 aircraft. (3) List the employee numbers of pilots certified for Boeing aircraft. (4) List the names of pilots certified for Boeing aircraft. (5) List the aircraft that can fly nonstop from Glasgow to New York (flyingRange > flightDistance). (6) List the employee numbers of employees who have the highest salary. (7) List the employee numbers of employees who have the second highest salary. (8) List the employee numbers of employees who are certified for exactly three aircraft.
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Indicate whether the statement is true or false