Database Management DBM500 UOP Week 2 DQ2

How do Entity relationship Diagrams (ERDs) help to ensure proper infobase universe?The importance of proper selective informationbase design was hatched in DQ1 of this week. Entity alliance Diagrams (ERDs) help ensure proper database design by diagrammatically showing the structure of a database. ERDs also help us learn key concepts about the data we need to employ or manipulate. For example, ERDs indicate:1. data relationships such as One-to-Many, Many-to-Many, Ambiguities2. what data needs to be stored3. the degree of a relationshipThe ERDs helps us pass judgment the design and to visit areas that whitethorn be of concern, or areas we whitethorn have missed. In an online lecture, Data Modeling with Entity Relationship Diagrams by Frances Wickham from the Medical University of South Carolina (http://www.srnr.arizona.edu/rnr/rnr417/erdiagrams3/erdiagrams.htm)Wickham indicates that data models such as ERDs are used as communication tools and also, ?p rovide the developer an opportunity to build up out conceptual and design issues and problems prior to beginning the in truth design process.?Wickham compares building a database to micturateing a building, the ERD is the blueprint from which the database pull out be built, and ?no reputable builder would start to conception a building without a detailed blueprint.?An entity is a person, throttle or thing about which data can be stored for tracking by the user. For example, an entity can be a customer, and the data that will be stored for that entity can be: the customer?s account number, the customer?s name, the customer?s overlay and the customer?s phone number. Relationship is the interaction surrounded by entities. For example, a customer which is an entity places an order at the accompany?s web-store which is also another entity. Placing the order is the link amid the both entities, thus the relationshipOnce the database tables have been created for the database it is then important to understand how the e! ntities... If you exigency to get a full essay, order it on our website: OrderCustomPaper.com

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