What does the term "cardinality" refer to in an ERD? 1. The information is stored in relation to a specific item. Maximum number of entity instances in a connection 3: The sum of an entity's main keys The sum of an entity's attributes

What does the term "cardinality" refer to in an ERD? 1. The information is stored in relation to a specific item. Maximum number of entity instances in a connection 3: The sum of an entity's main keys The sum of an entity's attributes

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.

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What does the term "cardinality" refer to in an ERD? 1. The information is stored in
relation to a specific item. Maximum number of entity instances in a connection
3: The sum of an entity's main keys The sum of an entity's attributes

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