100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
ISA 245 Exam 2 With 100% Correct And Verified Answers $17.99   Add to cart

Exam (elaborations)

ISA 245 Exam 2 With 100% Correct And Verified Answers

 8 views  0 purchase
  • Course
  • ISA 245
  • Institution
  • ISA 245

ISA 245 Exam 2 With 100% Correct And Verified Answers

Preview 2 out of 14  pages

  • September 2, 2024
  • 14
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • entity supertype
  • entity subtype
  • ISA 245
  • ISA 245
avatar-seller
Vendarsol
ISA 245 Exam 2 With 100% Correct And
Verified Answers
Entity supertype - Correct Answer-: Generic entity type
related to one or more entity subtypes
Contains common characteristics

Entity subtype - Correct Answer-Contains unique
characteristics of each entity subtype
Criteria to determine the usage
There must be different, identifiable kinds of the entity in
the user's environment
The different kinds of instances should each have one or
more attributes that are unique to that kind of instance

What is the specialization hierarchy? - Correct Answer-
Depicts arrangement of higher-level entity Supertypes and
lower-level entity subtypes

Relationships are described in terms of "is-a" relationships

Subtype exists within the context of a supertype

Every subtype has one supertype to which it is directly
related

Supertype can have many subtypes
Provides the means to:
Support attribute inheritance


Vendarsol

, Define a special supertype attribute known as the subtype
discriminator
Define disjoint/overlapping constraints and complete/partial
constraints

Use your own examples to explain the concepts of
inheritance, category subtype discriminator, disjoin and
overlapping constraints, and completeness constraint. -
Correct Answer-Inheritance Enables an entity subtype to
inherit attributes and relationships of the supertype, All
entity subtypes inherit their primary key attribute from
their supertype, Entity subtypes inherit all relationships in
which supertype entity participates

A subtype discriminator is the attribute in the supertype
entity that determines to which subtype the supertype
occurrence is related.

Disjoint subtypes: Contain a unique subset of the supertype
entity set
Known as nonoverlapping subtypes
Implementation is based on the value of the subtype
discriminator attribute in the supertype

Overlapping subtypes: Contain nonunique subsets of the
supertype entity set
Implementation requires the use of one discriminator
attribute for each subtype




Vendarsol

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller Vendarsol. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $17.99. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

80796 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$17.99
  • (0)
  Add to cart