Entity Relationship
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Title: Entity Relationship

Essay Details:

Subject: Technology
Author: Blanca H
Date: May 28, 2013
Level: University
Grade: B
Length: 2 / 416

Essay text:

It also has the manufacturer-make, product-in-store, product-in-warehouse, and customer-order relationships. 1.1 Entities. This project focuses on the product (or merchandise) entity. Its attributes include item number, model, type, price and quantity. The item number distinguishes every item, and we choose it as the primary key of product entity. Here quantity is a derived attribute, whose value can be calculated from the sum of item quantity at store and warehouse. Product can be divided into two disjoint subclass, laptop and desktop. We assume the computer retail company only sell computer, includes laptop and desktop...

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