Database Concepts (8th Edition)
8th Edition
ISBN: 9780134601533
Author: David M. Kroenke, David J. Auer, Scott L. Vandenberg, Robert C. Yoder
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Expert Solution & Answer
Chapter 4, Problem 4.13RQ
Explanation of Solution
Relationship:
An association between several entities is termed as relationship.
- It is used to link the attributes in entities.
- It is represented in a “diamond” box with name of the relationship in Entity-Relationship diagram.
The following diagram demonstrates the “relationship” among entities.
Difference between relationship class and relationship instance:
| Relationship class | Relationship instance |
| It is a relation between one with other entities (or) entity classes... |
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
What is the relationship between classes and objects?
Explain the mechanism needed to hide the instances from other classes. Support your answer with an example.
"JAVA PROGRAMMING LANGAUGE, OBJECT ORIENTED PROGRAMMING COURSE"
The following Object Relationship Diagram (ORD) is given. Write the definition for each class based on the ORD above. Include the overloaded constructors in each class
Chapter 4 Solutions
Database Concepts (8th Edition)
Ch. 4 - Prob. 4.1RQCh. 4 - Prob. 4.2RQCh. 4 - Prob. 4.3RQCh. 4 - What is a use case, and what is its purpose?Ch. 4 - Give an example of a data constraint.Ch. 4 - Prob. 4.6RQCh. 4 - Define the term entity, and give an example other...Ch. 4 - Explain the difference between an entity class and...Ch. 4 - Define the term attribute, and give examples for...Ch. 4 - Define the term identifier, and indicate which...
Ch. 4 - Prob. 4.11RQCh. 4 - Prob. 4.12RQCh. 4 - Prob. 4.13RQCh. 4 - Prob. 4.14RQCh. 4 - List and give an example of the three types of...Ch. 4 - Prob. 4.16RQCh. 4 - Prob. 4.17RQCh. 4 - Prob. 4.18RQCh. 4 - Define the term weak entity, and give an example...Ch. 4 - Explain the ambiguity in the definition of the...Ch. 4 - Define the term associative entity, and give an...Ch. 4 - Define the terms supertype, subtype, and...Ch. 4 - What is an exclusive subtype relationship? Give an...Ch. 4 - What is an inclusive subtype relationship? Give an...Ch. 4 - Prob. 4.25RQCh. 4 - Prob. 4.26RQCh. 4 - Prob. 4.27RQCh. 4 - Prob. 4.28RQ
Knowledge Booster
Similar questions
- Select the class relationship that best describes the following scenario: Class A can has a method that has no parameters. This method modifies an attribute of itself. Association (Reflexive) Association (Bidirectional) Association (Directed A to B) Association (Directed B to A) Composition (A as the whole and B as the part) Composition (B as the whole and A as the part) Aggregation (A as the whole and B as the part) Aggregation (B as the whole and A as the part) O Inheritance None of the givenarrow_forwardThe "SUPERVISES" Relationship is considered as: EMPLOYEE SUPERVISES O 1. Ternary Relationship O 2. Identifying Relationship O 3. Recursive Relationship O 4. Binary Relationshiparrow_forwardHow objects of a class are created if no constructor is defined in the class?arrow_forward
- 7- A course has many lectures. Each lecture has a start time and a class number.What should be the relation between the Course class and the Lecture class?a) The Lecture class should be a subclass of the Course class.b) The Course class should be a subclass of the Lecture class.c) The Course class should have a Lecture variable.arrow_forwardNote: The static variables/data fields and methods in UML class diagrams are underlined. Create an Account Object project. 1. Create an Account class and use the provided UML diagram to code the instance fields, constructors and methods. Note: The type of accounts are 1 (Savings) or 2 (Cheque) The constructor must assign the values of the parameters to the data fields/instance variables. The static field must be increased by one in the constructor. The setAccNumber() is a private void method. The account number must consist of the first 3 letters of the name of the account holder, the digit indicating the type of account and #-character and a 3-digit random value. This method must be called from the constructor. The makeDeposit() method must add the amount received as a parameter to the balance if the value received is not a negative value. The withdrawAmount() method must check whether the balance allows for the amount to be withdrawn. There must always be a minimum amount of…arrow_forwardObjective: To create a JSON for Scheme details with objects Scenario: Government wants to create a database for schemes launched in respective country. Application sends the details of schemes in the form of JSON Help to create a JSON with the information provided. Name Datatype of value Scheme String MinistryDetails Object LaunchedYear Number Country String BudgetInCrores Number MinistryDetails- Object : Name Datatype of value Ministry String MinisterName String HeadOfMinister String NOTE: You can assume any data for the mentioned JSON structure, provided it is matching the specified datatypearrow_forward
- Course: Database Systems: Design and Application Web Shop scenario: A supplier (Supp-#) processes many purchase orders (PO-#) and sells a number of products (Prod-#). A product is sold by only one supplier. Each of the purchase orders that a supplier may process includes several products. The relationship between order and product is defined as "Line Item". A customer (Cust-#) may place one or more purchase orders. A purchase order may be placed by only one customer. Assignment requirements: Answer the following questions using above scenario: Identify the entities and attributes that required to draw the ER diagram. Integrate the entities with appropriate relationship and design the unified ER model.arrow_forwardThe technique of packaging an objects attributes into a cohesive unit that can be used as an undivided entity is ____________. a. inheritance b. encapsulation c. polymorphism d. interfacingarrow_forwardComputer Sicence Objective: To create a JSON for Scheme details with objects Scenario: Government wants to create a database for schemes launched in respective country. Application sends the details of schemes in the form of JSON Help to create a JSON with the information provided. Name Datatype of value Scheme String MinistryDetails Object LaunchedYear Number Country String BudgetInCrores Number MinistryDetails- Object : Name Datatype of value Ministry String MinisterName String HeadOfMinister String NOTE: You can assume any data for the mentioned JSON structure, provided it is matching the specified datatypearrow_forward
- Differentiate between static and instance class members. Explain with proper example when you should make members static?arrow_forwardDifferentiate between class and structure. With an example explain the syntax for defininga class.arrow_forwardHow do you identify the potential classes in a problem domain description?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Microsoft Visual C#Computer ScienceISBN:9781337102100Author:Joyce, Farrell.Publisher:Cengage Learning,
Microsoft Visual C#
Computer Science
ISBN:9781337102100
Author:Joyce, Farrell.
Publisher:Cengage Learning,