A business wants to design a database for its daily operations. The business rules are given below. Create an ER diagram with necessary attributes that reflect the given business rules. You might use any style for the ER diagram. If it is applicable, include the cardinality in the diagram and use the diagram to identify weak entities and weak relationships. Business Rules: • A store may place many orders. • An order must be placed by a store

A business wants to design a database for its daily operations. The business rules are given below. Create an ER diagram with necessary attributes that reflect the given business rules. You might use any style for the ER diagram. If it is applicable, include the cardinality in the diagram and use the diagram to identify weak entities and weak relationships. Business Rules: • A store may place many orders. • An order must be placed by a store

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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Concept explainers

Enhanced ER Model

The enhanced ER model is an abbreviation for Enhanced Entity-Relationship (EER) model. As you know, the entity-relationship (ER) model is a pictorial illustration of the relationship between various entities of a domain. In the case of a large amount of data with multiple interrelated entities, the ER diagrams become complex and tough to interpret. For such cases, the need for enhancement in the ER model was observed, and thus, the EER model was designed.

Question

A business wants to design a database for its daily operations. The business
rules are given below. Create an ER diagram with necessary attributes that
reflect the given business rules. You might use any style for the ER diagram. If it
is applicable, include the cardinality in the diagram and use the diagram to
identify weak entities and weak relationships.
Business Rules:
• A store may place many orders.
• An order must be placed by a store
• An order contains at least one order line.
• Each order line is contained in one and only one order.
• Each order line has a specific product written in it.
• A product may be written in many orders.
• A store may employ many employees
• Each employee is employed by one (and only one) store.
• An employee may have one or more dependents.
• A dependent must be related to an employee.

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