what is the e-r-model for it multi composited valueX Draw E-R Model for the following:STOCKStock ID{Price History(Price, EffectiveDate)}

Answered: 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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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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