Database System Concepts
7th Edition
ISBN: 9781260084504
Author: Abraham Silberschatz, S. Sudarshan, Abraham, Henry Korth, Silberschatz Abraham, Silberschatz Professor
Publisher: McGraw-Hill Education
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Chapter 6, Problem 1PE
Program Plan Intro
Entity-Relationship diagram:
- Entity-Relationship (ER) diagram is the method to represent the relational
database using graphical form. - This graphical representation shows only primary elements such as records, types, attributes, relationships between entities, and so on.
- The graphical representation of the ER diagram clearly describes the relationship among entities.
- In the diagram, every connector is labeled.
- On one side it is represented by the value 1, and on the other side it is labeled with the value “M”. This labeling is referred to as “cardinality constraint” of the relationship.
Expert Solution & Answer
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Explanation of Solution
ER diagram for the Car Insurance Company:
Explanation:
In the above ER diagram, “Customer”, “Car”, “Accident”, “Insurance_Policy”, and “Premium_Payment” are the entities.
- The “Customer” entity contains “cust_ID”, “cust_Name”, “cust_Address” and “cust_Phone attributes. Here, “cust_ID” is a primary key.
- The “Car” entity contains “car_Num”, “model”, “make”, “color”, and “year” attributes. Here, “car_Num” is a primary key.
- The “Accident” entity contains “report_ID”, “location”, “date” and “damage_Cost” attributes. Here, “report _ID” is a primary key.
- The “Insurance_Policy” entity contains “policy_Num”, “policy_Name”, and “coverage” attributes. Here, “policy_Num” is a primary key.
- The “Premium_Payment” entity contains “payment_ID”, “payment_Date”, “due_date”, and “amount” attributes. Here, “payment_ID” is a primary key
Relationships between the entities:
- One “Customer” contains many “Car” so here, one-to-many relationship exists and named it as “Owns”.
- One “Car” contains many “Insurance_Policy” so here, one-to-many relationship exists and named it as “Covers”.
- One “Car” meets optional many (zero or many) “Accident” so here, one-to-optional many relationship exists and named it as “Meets”.
- One “Insurance_Policy” contains many “Premium_Payment” so here, one-to-many relationship exists and named it as “Payments”.
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Chapter 6 Solutions
Database System Concepts
Ch. 6 - Prob. 1PECh. 6 -
Consider a database that includes the entity sets...Ch. 6 -
Design an E-R diagram for keeping track of the...Ch. 6 - Prob. 4PECh. 6 - Prob. 5PECh. 6 - Prob. 6PECh. 6 - Prob. 7PECh. 6 -
Consider a relation such as sec_course, generated...Ch. 6 -
Suppose the advisor relationship set were...Ch. 6 - Prob. 10PE
Ch. 6 - Prob. 11PECh. 6 - Prob. 12PECh. 6 - Prob. 13PECh. 6 - Prob. 14ECh. 6 - Prob. 15ECh. 6 - Prob. 16ECh. 6 - Prob. 17ECh. 6 -
Consider two entity sets A and B that both have...Ch. 6 - Prob. 19ECh. 6 - Prob. 20ECh. 6 - Prob. 21ECh. 6 - Prob. 22ECh. 6 - Prob. 23ECh. 6 -
Design a database for an airline. The database...Ch. 6 - Prob. 25ECh. 6 -
Design a generalization – specialization...Ch. 6 -
Explain the distinction between disjoint and...Ch. 6 -
Explain the distinction between total and partial...
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