Create and ERD based on the Crow's Foot Model, using the following requirements. Include Primary Keys, Foreign Keys, and Relationship types (weak/strong):  1. An INVOICE is written by a SALESREP. Each sales representative can write many invoices, but each invoice is written by a single sales representative.  2. The INVOICE is written for a single CUSTOMER. However, each customer can have many invoices. 3. An INVOICE can include many detail lines(INV_LINE), each of which describes one product bought by the customer. 4. The product information is stored in a PRODUCT entity.  5. The product's vendor information is found in a VENDOR entity.

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
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Create and ERD based on the Crow's Foot Model, using the following requirements. Include Primary Keys, Foreign Keys, and Relationship types (weak/strong):

 1. An INVOICE is written by a SALESREP. Each sales representative can write many invoices, but each invoice is written by a single sales representative. 

2. The INVOICE is written for a single CUSTOMER. However, each customer can have many invoices.

3. An INVOICE can include many detail lines(INV_LINE), each of which describes one product bought by the customer.

4. The product information is stored in a PRODUCT entity. 

5. The product's vendor information is found in a VENDOR entity. 

 

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