Entity - Relationship Modelling Exercises by Artem Chebotko

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Presentation transcript:

Entity - Relationship Modelling Exercises by Artem Chebotko

Exercise 1 Draw an ER diagram and translate it to the relational model for the following: A customer orders at least one book from a bookstore. A bookstore can process (orders from) many (or none) customers. A book can be ordered many (or zero) times.

Exercise 2 Draw an ER diagram and translate it to the relational model for the following: A customer places at least one order. An order is placed by exactly one customer. An order is sent to exactly one bookstore. A bookstore handles many (or none) orders. An order includes at least one book. A book can be included in many (or zero) orders.

Exercise 3 Draw an ER diagram and translate it to the relational model for the following: An animal shelter has many (or none) pets. A pet can be a cat or a dog. No other kinds of animals are allowed in a shelter. A pet is characterized by a tag (unique id), name, breed, age, coat, pattern, and weight.

Exercise 4 Draw an ER diagram and translate it to the relational model for the following: An animal shelter has many (or none) pets. A pet can be a cat or a dog. No other kinds of animals are allowed in a shelter. A pet is characterized by a tag (unique id), name, breed, age, coat, pattern, and weight. In addition, height and other size characteristics are recorded for dogs and food preferences are recorded for cats. A dog is walked by a volunteer at least twice a day.

Exercise 5 Draw an ER diagram and translate it to the relational model for the following: An animal shelter has many (or none) pets. A pet can be a cat or a dog. Occasionally, a shelter hosts other kinds of animals (deer, raccoon, bird, etc.) that may require medical (veterinarian) treatment. A pet is characterized by a tag (unique id), name, breed, age, coat, pattern, and weight.

Exercise 6 Draw an ER diagram and translate it to the relational model for the following: A computer programmer in a software development company is described by an employee id, name, phone, address, email, and set of skills (non-empty set). A programmer works on many (or none) projects. A project has at least one programmer assigned to it. A project has a name, description, and set of skills (non-empty set) required to contribute to it.

Exercise 7 Draw an ER diagram and translate it to the relational model for the following: A university offers a number of courses. A course may have one or more (or none) courses as prerequisites. A course may or may not have one or more scheduled sections. A professor teaches at least one course section. A student is enrolled in at least three and at most seven course sections. A professor assigns grades to students enrolled in a course section that s/he teaches.

Exercise 8 Draw an ER diagram and translate it to the relational model for the following: A bank offers three types of accounts: checking, savings, and loan/credit. A checking account has account-number, date-opened, balance, and service-fee. A savings account has account-number, date-opened, balance, and interest-rate. A loan/credit account has account-number, date-opened, balance, service-fee, interest-rate, and credit-limit.