+1-415-670-9189
info@expertsmind.com
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
Prove that the algorithm for decomposing a relation schema with a set of FDs into a collection of BCNF relation schemas as described in Section 19.6.1 is correct (i.e., it pro
Write a program to calculate the tax of an employee whose employee number is input from the keyboard. Display an appropriate error message if the data does not exist in t
Design and implement an application that reads an integer value representing a birthdate from the user. First get the month, then get the day and then finally the year from
Each query is worth 2 marks. These tables exist in sphinx and are owned by the user dtoohey. You may, if you wish, create your own copies of the tables under your own accoun
Explain these situations. When would the database be more beneficial than sequential file? Is it possible for two kinds of permanent storage to be used interchangeably?
The library System stores 3 type of informations: Users ( USID, USNAME, USMob, USEmail, USDept,USStartDate, NofBooks). Create the library database schema Structure.
When a student has not chosen a major at a university, the university often enters a value of "Undecided" for the major field. Is "Undecided" a way to represent the null value
What are the advantages and disadvantages of front-end and back-end validation and in which specific situations would one technique of validation be preferred over the other?