For each of the descriptions below perform the following tasks: a. A book is identified by its ISBN number and it has a title, a price, and a date of publication. It is published by a publisher which has its own ID number and a name. Each book has exactly one publisher but one publisher typically publishes multiple books over time.
b. A book is written by one or multiple authors. Each author is identified by an author number and has a name and a date of birth. Each author has either one or multiple books. In addition, occasionally data are needed regarding prospective authors who have not yet published any books.
c. In the context specified in 2a and 2b better information is needed regarding the relationship between a book and its authors. Specifically, it is important to record the percentage of the royalties that belong to a specific author whether or not a specific author is a lead author of the book and each author's position in the sequence of the book's authors.
d. A book (2a) can be part of a series which is also identified as a book and has its own ISBN number. One book can belong to several sets and a set consists of at least one but potentially many books.