Entity-relationship diagram
Course:- Database Management System
Reference No.:- EM13419

Assignment Help
Assignment Help >> Database Management System

Create an entity-relationship diagram and design accompanying table layout using sound relational modeling practices and concepts. The relationships between the entities and the attributes for the entities will be described. This database will provide the foundation for the follow-on project. The subsequent paragraphs provide the background and summary of the business requirements.

You are a database consultant with Ace Software, Inc. and have been assigned to prepare a database for the Mom and Pop Johnson video store in town. Mom and Pop have been keeping their records of videos and DVDs purchased from distributors and rented to customers in stacks of invoices and piles of rental forms for years. They have finally decided to automate their record keeping with a relational database.

1. Evaluate and list your entities. Then explain fully the relationships between entities via pairs of sentences that shows the two components of the total relationship in both directions between the entities. Relationships may be unary, binary, or ternary with respect to entities. You could not have any many-to-many relationships.

2. Begin the database logical design by identifying the entities, relationships between entities, and entities' attributes. Use the same entity/relationship diagram (ERD) notation as used in class for entities, attributes, and relationships. Sketch your ERD by hand or a drawing program (e.g., Visio, PPT, SQL Modeler ...) on one single 8-1/2" x 11" page (8-1/2" x 14" maximum), labeled "Mom and Pop Johnson Video Store Database E/R Diagram." Your ERD could not have any many-to-many relationships between entities.

3. Complete the logical database design and start the physical database design by preparing metadata documentation) that describes the table(s) created from each entity and thecolumn(s) created from each attribute in the ERD. Attributes could be self-describing. Particular attention will be given to the proper specification of all primary key (via "PK") and foreign key (via "FK") columns in the table layouts. These could match your ERD exactly. Begin these descriptions on a page labeled "Proposed Database Tables and Columns based on E/R Diagram." All tables must be 3rd Normal Form. Shows any and all assumptions that were made.

Ask Question & Get Answers from Experts
Browse some more (Database Management System) Materials
Create the DigitalX database. Design tables and relationships and ensure that email addresses may only be used once in the database.
Describe briefly what are the main benefits of using DBMS to manage data in program applications involving extensive data access.
Start with LAN on RTA and proceed clockwise. Determine the number that how many total valid host addresses will be wasted on WAN links?
Write the CREATE INDEX statements to create a clustered index on the GroupID column and a nonclustered index on the IndividuallD column of the GroupMembership table.
Company's databases do not give them with information required for market planning, lead generation, and account management. What does author say is root cause of this problem
What is meant by a weak relationship? Provide an example. What is meant by weak entity? What do you understand by relationship degree?
Write SQL queries for the books database that perform each of the following tasks: Select all authors from the Authors table with the columns in the order lastName, firstName
Describe the different procedure performed in DBMS for student database in which fields are student id, student name, student class, marks.