Database Systems: Design, Implementation, & Management

11th Edition

ISBN: 9781285196145

Author: Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel

Publisher: Cengage Learning

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Data Dictionary

A database management system has an entity-relationship diagram, data dictionary, and data model as some of its key components, which are tools for the users who are managing the database. One of them is the data dictionary. The data dictionary can also …

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Chapter 4, Problem 17RQ

Explanation of Solution

Cardinality:

Connecting lines among the entities will illustrate the relationships of entities in the ER diagram.

“Cardinality” states that how many occurrences of an entity relate to one occurrence of other entity.

Crow’s Foot symbols and its cardinality:

The following table illustrates the different connectivity and participation combinations which are maintained by the Crow’s Foot notation:

Notation Cardinality Description

(0,N) Zero or more instances

(1,N) One or more instances

(1,1) One instance

(0,1) Zero or one instance

Cardinalities for given ERD:

The following figure illustrates the cardinalities for each relationship in given ER diagram:

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Chapter 4, Problem 16RQ

Chapter 4, Problem 18RQ

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Rick and Ryan Enterprises is an agency that specializes in representing clients in the fields of sports and entertainment. Given the nature of the business, some employees are given a company car to drive and each company car must be assigned to an employee. Each employee has a unique employee number, plus an address and set of certifications. Not all employees have earned one or more certifications. Company cars are identified by their vehicle ID and also contain a license plate number, make, model, and year. Employees represent clients. Not all employees represent clients while some employees represent many clients. Each client is represented by one and only one employee. Each client has a unique client number. Additional attributes required for each client are name, address, and date of birth. Draw an ER diagram that shows the entity types and the relationship types for Rick and Ryan Enterprises. While you must name each relationship type and define the structural…

Please convert the following ERD to RDM The following ERD shows the following information: Some College employees are information technology (IT) staff. Some IT staff are professors who teach IT courses. IT personnel are required to take periodic training to retain their technical expertise. EMPLOYEE EMP NUM EMP LNAME EMP FNAME EMP HIREDATE EMP STAFF EMP ADMIN EMP PROF {optonal, or Teet IT STAFF ADMIN PROFESSOR EMP NUM EMP NUM EMP NUM STAFF LEVEL ADMIN POSITION PRO SPECIALTY PRO RANK has TRAINING TRAINING ID TRAINING CATEGORY

The same description as Problem I. You are asked to display order's item list and meal cost to customer. Each meal must have at least one main item, but side item and drink are optional. Also, a 10% coupon code is available to use. So the main items can be decorated by the side items, drink and coupon. This gives a customer flexibility to order any number of sides or drinks for a meal. Please note that each side item and drink can be multiple or partial. The cost of multiple or partial side and drink is adjusted proportionally, for example, cost of 2 orders of Coke is 2x$1.00, 40% order of Fries is 0.4x$1.5. However, coupon can be used only once per order. We would like to use the Decorator pattern and Singleton pattern to create the receipt to show order's item name, quantity, item unit price, item cost, any coupon applied and final cost. The singleton is to ensure that the coupon can be applied only once in an order. Here is price for each item Main items, Hamburger: $6.5;…

Chapter 4 Solutions

Database Systems: Design, Implementation, & Management

Ch. 4 - Prob. 1RQ Ch. 4 - What is a strong (or identifying) relationship,...Ch. 4 - Prob. 4RQ Ch. 4 - Suppose you are working within the framework of...Ch. 4 - Prob. 6RQ Ch. 4 - Prob. 7RQ Ch. 4 - Discuss the difference between a composite key and...Ch. 4 - What two courses of action are available to a...Ch. 4 - Prob. 11RQ Ch. 4 - Discuss two ways in which the 1:M relationship...

Ch. 4 - Prob. 13RQ Ch. 4 - Prob. 14RQ Ch. 4 - Briefly, but precisely, explain the difference...Ch. 4 - What are multivalued attributes, and how can they...Ch. 4 - Prob. 17RQ Ch. 4 - Prob. 18RQ Ch. 4 - What two attributes must be contained in the...Ch. 4 - Describe precisely the composition of the...Ch. 4 - Prob. 21RQ Ch. 4 - Prob. 1P Ch. 4 - Create a complete ERD in Crows Foot notation that...Ch. 4 - Prob. 4P Ch. 4 - Prob. 5P Ch. 4 - Prob. 6P Ch. 4 - Prob. 7P Ch. 4 - Prob. 8P Ch. 4 - Prob. 9C

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