d) Write the following guery in sQL Find the names of all shicents who arc not enrolled in any class. e) Write the following query in SQL For each class, find the averude age of all students who are enrolled i that clais.

Explain the principles of object-oriented programming (OOP) and how they are applied in software development. Provide examples of OOP concepts such as encapsulation, inheritance, and polymorphism.

ER-Diagram and EER-Diagram Medinah Transport dealership sells Proton, Ford, Honda and Toyota. The dealership keeps the cars information such as vehicle number, list price, chassis number, made (eg. Honda, Toyota), model name (eg. Civic, Camry) and year. They also keep information about all sales they have made (for instance, invoice number, buyer’s name, data of purchase and amount paid for the car). In order to contact the buyers in the future, the dealership also keeps their telephone number and address. Some buyers bought more than one car. For statistical purposes, the buyer’s gender and age are also captured. Dealer also needs to know the staff who sold the cars to the buyers such as their staff ID, name, phone number, gender, date of birth, address and basic salary. The dealership has two types of staff - sales agent and admin. Sales agent will have sales quota, basic salary and sales commission from selling cars. While admin staff will receive basic salary and overtime (based on…