introduction to database system

chapter 1 and 2

need help for the exam

Draw the ER diagram for a local bookstore database based on the following information: 1. Each book has a title, abstract, and ISBN. The ISBN is unique to each book; 2. Some of these books are computer science textbooks, in which case there is an additional piece of associated information - the programming language used for instruction in the book 3. One book may cite other books, and may be cited by other books as well; 4. Each book is published by a publisher although such publisher information may not always be available in the database; 5. A publisher has a unique name, as well as a city and year of the establishment; 6. Each book is written by one or more authors. An author must have written at least one textbook to be included in the database; 7. An author has a name, an address and an SSN. The SSN is unique to each author. Remember to indicate the key for each entity, as well as the multiplicity of each relationship (e.g. one-to-many) and the referential integrity constraints, using the appropriate notation. Based on the diagram you drew in Problem 2, convert this ER diagram into a set of relations