Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Think about what you'd want to see in an entity identifier, then write it down.
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- Design EERD schema for the system.arrow_forwardWhat is the recursive entity?arrow_forwardWhat does the weak entity type really mean? What's the secret? Give an instance What does alternative specialization mean?How am I shown on the ER diagram? Give an example and create a diagram to match it.arrow_forward
- What is the difference between a weak and a strong entity set?arrow_forwardWhat is the difference between an object in an object oriented model and an entity in an entity relationship model?arrow_forwardLearning Objective PI3.2 Understand the process of entity-relationship modeling. STEP 1: Background It is very important that you understand the connections among entities, attributes, and relationships. This section has defined each of these terms for you. Typically, entities are described by their attributes, and they are related to other entities. For example, if "student name" is the entity, then age, gender, country of origin, marital status, and other demographic data are the attributes (characteristics) of that particular student. That student is also related to other entities such as financial information, major, and course information. STEP 2: Activity An entity-relationship model is one of the most challenging aspects of designing a database because you have to (1) understand the rules that govern how processes work and (2) be able to define and describe these rules in a picture. This section has provided you with the necessary tools to draw a basic ER model. Imagine the…arrow_forward
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