Database Concepts (7th Edition)
7th Edition
ISBN: 9780133544626
Author: David M. Kroenke, David J. Auer
Publisher: PEARSON
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Expert Solution & Answer
Chapter 5, Problem 5.20RQ
Explanation of Solution
Many-to-many relationship (N:M):
Many-to-many relationship is one of the types of binary relationship that refers to the relationship that is laid between the two entities which means that many records in a table are associated with many records in another table.
Example:
In a library
IE crow’s foot ER diagram:
Information Engineering is a method to represent the relationship between the entities. It uses crow’s foot to denote the many sides of a relationship. Hence, it is referred to as IE crow’s feet ER diagram.
- Relational database system will not allow the user to implement a direct many-to-many relationship. Therefore, the many-to-many relationship will break into two one-to-many relationships the using third table and it is called “intersection table”...
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Chapter 5 Solutions
Database Concepts (7th Edition)
Ch. 5 - Explain how entities are transformed into tables.Ch. 5 - Prob. 5.2RQCh. 5 - Prob. 5.3RQCh. 5 - What is denormalization?Ch. 5 - Prob. 5.5RQCh. 5 - Explain the problems that denormalized tables may...Ch. 5 - Explain how the representation of weak entities...Ch. 5 - Explain how supertype and subtype entities are...Ch. 5 - Prob. 5.9RQCh. 5 - Prob. 5.10RQ
Ch. 5 - Show two different ways to represent the 1:1...Ch. 5 - Prob. 5.12RQCh. 5 - Prob. 5.13RQCh. 5 - Prob. 5.14RQCh. 5 - Prob. 5.15RQCh. 5 - Prob. 5.16RQCh. 5 - For your answer to question 5.15, code an SQL...Ch. 5 - Prob. 5.18RQCh. 5 - Prob. 5.20RQCh. 5 - Prob. 5.21RQCh. 5 - Explain how the terms parent table and child table...Ch. 5 - For your answers to questions 5.20, 5.21, and...Ch. 5 - Prob. 5.24RQCh. 5 - Prob. 5.25RQCh. 5 - Prob. 5.26RQCh. 5 - Prob. 5.27RQCh. 5 - Prob. 5.28RQCh. 5 - Define the three types of recursive binary...Ch. 5 - Prob. 5.30RQCh. 5 - Prob. 5.31RQCh. 5 - Prob. 5.32RQCh. 5 - Prob. 5.33RQCh. 5 - Prob. 5.34RQCh. 5 - Code an SQL statement that creates a table with...
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- A customer can make many payments, but each payment is made by only one customer.” Use this scenario as the basis for an entity relationship diagram (ERD) representation using either Chen, Crow’s Foot or UML Class Diagram.arrow_forwardDesign an Entity-Relationship for each system described below. Use the (min,max) notation. State clearly any additional assumptions you make. Give the relational model by applying the mapping rules (WITH REFERENCES AND ARROWS). NOTE: USE CHEN ER DIAGRAM (YOU CAN USE VISIO MICROSOFT(TEMPLATE=CHEN) ONLY SHOWING THE ENTITIES/ATTRIBUTES/WEAK ENTITIES/RELATIONSHIPS/PRIMARY KEY-FK/ (MIN-MAX) NOTATIONS ALSO NOT FORGETTING THE REFERENCES ON THE MAPPING TABLES WITH ARROWS REFERRING THE FOREIGN KEYS. YOUR WORK SHOULD BE SPECIFIC WITH JUSTIFICATION. We consider a library that contains books that can be borrowed. A book is characterized by a unique number, a title, an author and a publisher. In addition, we describe a book by a number of keywords that indicate the treated subjects. The library has one or more copies of each book; the copy is identified by a number and characterized by its position on the shelves and the date of purchase. A copy can be borrowed by a borrower. This latter is…arrow_forwardDesign an Entity-Relationship for each system described below. Use the (min,max) notation. State clearly any additional assumptions you make. Give the relational model by applying the mapping rules (WITH REFERENCES AND ARROWS). NOTE: USE CHEN ER DIAGRAM (YOU CAN USE VISIO MICROSOFT(TEMPLATE=CHEN) ONLY SHOWING THE ENTITIES/ATTRIBUTES/WEAK ENTITIES/RELATIONSHIPS/PRIMARY KEY-FK/ (MIN-MAX) NOTATIONS ALSO NOT FORGETTING THE REFERENCES ON THE MAPPING TABLES WITH ARROWS REFERRING THE FOREIGN KEYS. YOUR WORK SHOULD BE SPECIFIC WITH JUSTIFICATION. Consider a Mail_Order database in which employees take orders for parts from customers. The data requirements are summarized as follows: The mail order company has employees, each identified by a unique customer number, first and last name, and ZIP code. Each customer of the company is identified by a unique customer number, first and last name, and ZIP code. Each part sold by the company is identified by a unique part number, a part name, price,…arrow_forward
- Design an Entity-Relationship for each system described below. Use the (min,max) notation. State clearly any additional assumptions you make. Give the relational model by applying the mapping rules (WITH REFERENCES AND ARROWS). NOTE: USE CHEN ER DIAGRAM (YOU CAN USE VISIO MICROSOFT(TEMPLATE=CHEN) ONLY SHOWING THE ENTITIES/ATTRIBUTES/WEAK ENTITIES/RELATIONSHIPS/PRIMARY KEY-FK/ (MIN-MAX) NOTATIONS ALSO NOT FORGETTING THE REFERENCES ON THE MAPPING TABLES WITH ARROWS REFERRING THE FOREIGN KEYS. YOUR WORK SHOULD BE SPECIFIC WITH JUSTIFICATION. We want to build a database for a community of paleontologists, storing information about the fossils kept in different museums. Each fossil is described by the year and place of discovery, the name of the paleontologist who discovered it, the room where it is exposed, and the presumed species. Each fossil may be assigned to different species with different degrees of probability. Museums are characterized by their rooms, their paleontologists and…arrow_forwardPlease provide a list and illustrative example for the three forms of binary relationships that are not covered in this book. Draw a regular E-R diagram as well as an IE Crow's Foot E-R diagram for each of the three cases studied here.arrow_forwardPerform given tasks on Case study Q-Find entity Attribute and primary key, also draw Entity diagram? Case study: In a college we have students, department, teachers and courses. A student has name registration No and address. A teacher has name NIC and qualification. A department is known by its name e.g. CSIT, and have a HOD name , Num of students and Floor No. A course is identified by its Code. Course also has name and level of degree. A student must enroll (roll no and Semester as relationship attribute) in any one department. A department can have many students. The teacher is assigned class (time and day as attribute) in more than one department. A department has many teachers. A student can study up-to 5 courses by a teacher in given classroom number.arrow_forward
- What is the purpose of entity-relationship diagrams? What sort of symbol is used to depict a connection, and how does it work? What exactly does the phrase "associative entity" imply and what does it mean? Give an example.arrow_forwardPlease help me with this question ERD diagram.arrow_forwardDescribe how the weak entity of an E-R diagram is transformed into relationsarrow_forward
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