### Entity-Relationship Cardinality RatiosAn entity-relationship table helps in understanding the various relationships between different entities within a database. Below is the detailed table that outlines some common entities and their cardinality ratios.| | Entity 1 | Cardinality Ratio | Entity 2 ||---|-------------------------|----------------------------------------------------------------------------------------------------------|---------------------|| 1 | Student | 1-many: A student may have more than one social security card (legally with the same unique social security number), and every social security number belongs to a unique student | Social security card|| 2 | Student | | Teacher || 3 | Classroom | | Wall || 4 | Country | | Current President || 5 | Course | | TextBook || 6 | Item (that can be found in an order) | | Order || 7 | Student | | Class || 8 | Class | | Instructor || 9 | Instructor | | Office ||10 | E-bay Auction item | | E-bay bid |#### Explanation:1. **Student - Social Security Card:** A student can have multiple social security cards, but each social security number uniquely identifies one student.2. **Student - Teacher:** This entry indicates a relationship but doesn't specify the cardinality. Generally, a student can have multiple teachers, and a teacher can have multiple students.3. **Classroom - Wall:** This relationship associates a classroom with a wall, indicating that walls are integral parts of classrooms.4. **Country - Current President:** Each country is associated with one current president at a time.5. **Course - TextBook:** A course may have several textbooks, and a textbook can be used in multiple courses.6. **Item (in an order) - Order:** Items are components of orders. An order can contain multiple items.7. **Student - Class:** This indicates that students attend classes.8. **Class - Instructor:** Classes are taught by instructors.9. **Instructor - Office:** Instructors are associated with offices.10. **E-bay Auction item - E-bay bid:** An E-bay auction item can have multiple bids associated with it.This table helps in visualizing the relationships and understanding database design better.

Entity relation, also known as entity-relationship modeling, is a technique used in software…

1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Entity 1 Student Student ClassRoom Country Course Item (that can be found in an order) Student Class Instructor E-bay Auction item Cardinality Ratio 1-many A student may have more than one social security card (legally with the same unique social security number), and every social security number belongs to a unique student Entity 2 social security card Teacher Wall CurrentPresident TextBook Order Class Instructor Office E-bay bid

1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Entity 1 Student Student ClassRoom Country Course Item (that can be found in an order) Student Class Instructor E-bay Auction item Cardinality Ratio 1-many A student may have more than one social security card (legally with the same unique social security number), and every social security number belongs to a unique student Entity 2 social security card Teacher Wall CurrentPresident TextBook Order Class Instructor Office E-bay bid

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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