Entity Relationship Diagram of a Video Rental Store

Entity Relationship Diagram The bellow diagram is what is refered to as an "Entity Relationship Diagram". Its purpose is to show the relationship between different data in the hotel management program , and the actions that are performed on it. And how data from different objects relate to each other. Legend The Data Entities represent data that will need to be stored on the system, in general terms. The Relationships represent actions that will occur to the Data Entities, or Weak Entities. The…

In the video rental industry, the company Blockbuster took an early foot hold as the industry leader. In 1997, Marc Randolph and Reed Hastings discovered the growing market space within the DVD market and formed the company Netflix in Scotts Valley, California with $2.5 million in startup cash. The company was formed with the idea that customers could utilize the company’s web site to rent DVDs and have them delivered to their home. The inspiration for the company came from Reed Hastings after he…

license model year car report-number location date driver participated accident damage-amount Figure 2.1 E-R diagram for a Car-insurance company. Exercises 2.1 Explain the distinctions among the terms primary key, candidate key, and superkey. Answer: A superkey is a set of one or more attributes that, taken collectively, allows us to identify uniquely an entity in the entity set. A superkey may contain extraneous attributes. If K is a superkey, then so is any superset of K. A superkey for…

well known video store chain. Different genders were looked at in groups of all male or all female, single men and single women, and then groups of mixed gender. Differences between the two were measured in actions, words, and attitudes. The findings were in sync with what society generalizes so broadly as: men and women differ in everything they do. The research was conducted not to prove this familiar concept wrong but to show how men and women differ in a general setting of a video store. The data…

Contents ERD (Entity Relation Diagram) 2 2.1 History of ERD 2 2.2 Building Blocks 2 2.2.2 Relationship 2 2.3. Diagramming Conventions 3 MS ACESS TABLE 5 3.1 Parts of Table 6 3.2 Creating Tables in Access 6 Chapter No 2 ERD (Entity Relation Diagram) 2.1 History of ERD An entity-relationship model (ERM) is an abstract and conceptual representation of data. Entity-relationship modeling is a database modeling method, used to produce a type of conceptual schema or semantic data…

Overlook Video Stores Inc. (OVS) To: Ms. Alice Hartford, Partner From: CA, Audit Senior Re: Planning for the year end 2009 of OVS and requested control deficiency information Engagement Overview The purpose of this memo is to document the planning of the financial statement audit st engagement of our client Overlook Video Stores Inc. (OVS) for the year ended December 31 , 2009. OVS has been our client since its inception in 1998. This year’s audit will commence January, 2010, th…

The video rental industry is an ever evolving industry that changes with the economy, evolution of culture, and technology. Due to the changes in general environment surrounding the video rental industry, it can be said that this once lucrative brick and mortar industry has gone through a death and rebirth. New concepts of distribution such as Netflix, Redbox, and cable rentals have hastened the extinction of the weekend drive to the video rental store. Various forces influence the video rental industry…

Review Entity-Relationship Diagrams and the Relational Model CS 186, Fall 2007, Lecture 2 R & G, Chaps. 2&3 A relationship, I think, is like a shark, you know? It has to constantly move forward or it dies. And I think what we got on our hands is a dead shark. Woody Allen (from Annie Hall, 1979) • Why use a DBMS? OS provides RAM and disk Review • Why use a DBMS? OS provides RAM and disk – Concurrency – Recovery – Abstraction, Data Independence – Query Languages – Efficiency (for most tasks) – Security…

An entity relationship diagram is the basic design model for any database. It is the major deliverable for a conceptual database design. It is the logical organization of any data in the database and is usually made up of three components namely; entities, attributes and relationships. Entities are the major categories of data in the database and are usually represented by rectangles. Attributes are the characteristics of the entities and are usually written in the rectangle. Relationships are the…

The Entity-Relationship Model ------------------------------------------------- Top of Form Bottom of Form Database Design Goal of design is to generate a formal specification of the database schema Methodology: 1. Use E-R model to get a high-level graphical view of essential components of enterprise and how they are related 2. Then convert E-R diagram to SQL DDL, or whatever database model you are using E-R Model is not SQL based. It's not limited to any particular DBMS. It is a conceptual…