- Find the name of instructor who works in the physics department and his salary is between 100000 and 90000 (1 Mark) 2. Find the name of students who study in the electrical engineering department and takes more than the average total credits (1 Mark) 3. find the prerequisite course for Robotics (1 Mark) 4.Create triggers for credits change, the trigger should be activated before the database is updated and should prevent any change of course credits. The trigger should display an appropriate massage. (1 Mark)