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Question:
(a) Can a set of data requirements be correctly modelled by two or more different ER diagrams? Explain your answer. You may use a small example, if you think it will help your explanation.
(b) What is a recursive relationship? Give an example of a many to many recursive relationship.
This question refers to the Appendix where the relational schema for an online DVD rental system is defined.
(c) Express the following queries using relational algebra:
(i) Find all DVD titles with their certificate being ‘15' and their type name being ‘Drama'
(ii) Find names of all members and the titles of DVDs, which they have rented between 1st
May 2007 and 31st May 2007
(iii) Find names of all the members who have rented any DVD with type name ‘Comedy' but not any DVD with Type name ‘Action'
Explain the main advantages of DBMS over File Oriented System ?
entity relationship diagram about finance
How to create values of structured type? Constructor functions are used to make values of structured types. A function with the similar name as a structured type is a construct
Define seek time. The time for repositioning the arm is known as the seek time and it enhances with the distance that the arm is known as the seek time.
Home based assignment Consider an ORDER table with the following attributes: • Order Number (ONo),Customer Number (CNo),Customer Name (CNa),Item Number (INo),Unit Price (UP), Quant
Why is database design important?
Prepare a data flow diagram for computing the volume and surface area of a cylinder. Inputs are the height and radius of the cylinder. Outputs are the volume and surface area of th
Explain Thomas' Write rule. Show how it is different from timestamp ordering protol Ans: In timestamp-based concurrency control the thomas Write rule is a rule. Given a Timest
Fundamentals of Database Management 1. Explain the concept of Foreign Key. How a foreign key differs from a Primary Key? Can the Foreign Key accept nulls? 2. With a necess
What is the need for triggers? Triggers are useful mechanisms for alerting humans or for starting particular tasks automatically when particular conditions are met.
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