Consider the schemas for the table people, and the table’s students and teachers, which were created under people, in Section 9.3.Give a relational schema in third normal form that represents the same information. Recall the constraints on subtables, and give all constraints that must be imposed on the relational schema so that every database instance of the relational schema can also be represented by an instance of the schema with inheritance.
Answer to relevant QuestionsA car-rental company maintains a vehicle database for all vehicles in its current fleet. For all vehicles, it includes the vehicle identification number, license number, manufacturer, model, date of purchase, and color. ...Consider an employee database with two relations employee (employee-name, street, and city) works (employee-name, company-name, salary) where the primary keys are underlined. Write a query to find companies whose employees ...Write the following queries in XQuery, assuming the DTD from exercise.a. Find the names of all employees who have a child who has a birthday in March.b. Find those employees who took an examination for the skill type ...Write queries in XQuery on the bibliography DTD fragment as shown below to do the following.a. Find all authors who have authored a book and an article in the same year.b. Display books and articles sorted by year.c. Display ...Show the structure of the file as shown below after each of the following steps: a. Insert (Brighton, A-323, 1600). b. Delete record 2. c. Insert (Brighton, A-626, 2000).
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