Management of Database dis4
Use below the new template to answer this forum question:
Post 3-4 detailed paragraphs on one of the following topics:
What is an entity supertype, and why is it used?
What kinds of data would you store in an entity subtype?
What is a subtype discriminator? Given an example of its use.
What is an overlapping subtype? Give an example.
Be sure to cite your references.
Need Reference in the below format
What is an entity supertype, and why is it used?
Critical thinking: My guess answer is (in your own words)
I believe an entity supertype is a more important entity than all the other entities.
Reference #1 – What does the book say about the question: Use the bibliography for our book after the quote in APA form.
“ An entity supertype is a generic entity type that is related to one or more entity subtype. The entity supertypecontains common characteristics, and the entity subtype each contains their own unique characteristics. Two criteria help the designer determine when to use subtypes and supertypes:
· There must be different, identifiable kinds or types of the entity in the user’s environment.
· The different kinds or types of instances should each have one or more attributes that are unique to that kind or type of instance.”
Database Systems: Design, Implement, and Management, Eleventh Edition
Carlos Coronel and Steven Morris
@2015, 2013 Cengage Learning
Reference #2 – What does the Internet say about the question (or another resource): Paste it here with the link to the website in APA form.
“An entity supertype is a generic entity type that is related to one or more entity subtypes, where the entitysupertype contains the common characteristics and the entity subtypes contain the unique characteristics of each entity subtype. The reason for using supertypes is to minimize the number of nulls and to minimize the likelihood of redundant relationships”
Pastbin.com, 2014. What is an entity supertype, and why is it used? (2014, March 25). Retrieved April 07, 2016, from http://pastebin.com/1aHYXtkj
How did your guess and the two references answers differ?
I was wrong because I believed that an entity supertype meant that it was more important than the other entities.
Were you wrong? Were you right?
What do you think the right answer is now in your own words.
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