e-r-model for it multi composited value
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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Transcribed Image Text:what is the e-r-model for it multi composited value
X Draw E-R Model for the following:
STOCK
Stock ID
{Price History
(Price, Effective
Date)}
Expert Solution

Step 1 E-R model for it multi composited value
E-R model is an entity relationship model. it is a high-level data model. It is a design of a database that can later be implemented as a database. It represents correlated things of interest in a fixed domain of knowledge. A simple E-R model is consist of entity types and specifies relationships that can exist between entities.
In E-R model, multi-valued attributes are represented by double oval.
In E-R model, composite-valued attributes are represented by an oval comprising of ovals.
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