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  #1 (permalink)  
Registered User
Join Date: Jun 2011
Posts: 1
Red face Help with Conceptual ERD

Hi! So I am very new..and was hoping I could get some help
I am taking a Database Design course, and we are supposed to be creating a conceptual ERD for a simple DVD rental business using Crows's Foot Notation. It does not need to be normalized and cardinalities are not required in the diagram, though relationship connectivity are required.

I devised these business rules (hopefully they make sense and are actually valid):
-Each customer is assigned to one customer identification number.
-Each movie can be viewed on one or more devices
-A device can only play one movie at a time
-A movie is viewable for 72 hours once rental has begun.
-A customer can rent at max five movies a day

I think my entities are:
Personal Device
ID Number

That's pretty much all I've got...help? suggestions?
Thanks so much!!
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  #2 (permalink)  
Registered User
Join Date: Apr 2010
Location: London, England
Posts: 24
Data Models to help you


Take a look at these Data Models on my Database Answers Web Site which should give you some ideas :-
Video Rental Stores - Video Rental Store

CD Collections - CD Collection Data Model


Barry Williams
London, England
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  #3 (permalink)  
vaguely human
Join Date: Jun 2007
Location: London
Posts: 2,527

The aim of a student's coursework is to teach them certain points about database design and how to think logically. Guiding them is fine, asking them questions that make them think is even better but handing them an answer on a plate is just plain wrong.

Doing this means they miss the most basic part of their course - how to think. I'm guessing that the lecturer will easily spot which homework was done by 1st year students and which was done by a database professional. I'm also guessing that if two students hand in the same answer then questions will be raised. But the main issue is that each coursework is supposed to teach the student something and this student is going to learn nothing.
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database design, erd diagram, help needed

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