Question: When might a supertype/subtype hierarchy be useful?

When might a supertype/subtype hierarchy be useful?

Step by Step Solution

★★★★★

3.45 Rating (174 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer
Step: 1 Unlock

A supertypesubtype hierarchy is useful when you have se... View full answer

blur-text-image
Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock
Step: 3 Unlock

Document Format (1 attachment)

Word file Icon

613-CS-DB (1634).docx

120 KBs Word File

Students Have Also Explored These Related Databases Questions!

Q:

Contrast the following terms: a. Supertype; subtype b. Generalization; specialization c. Disjoint rule; overlap rule d. Total specialization rule; partial specialization rule e. PARTY; PARTY ROLE f....

Q:

When is a member of a supertype always a member of at least one subtype?

Q:

Define each of the following terms: a. Supertype b. Subtype c. Specialization d. Entity cluster e. Completeness constraint f. Enhanced entity-relationship (EER) model g. Subtype discriminator h....

Q:

When might a supertype/subtype hierarchy be useful?

Q:

When might a supertype/subtype hierarchy be useful?

Q:

Chapter 2: What is an Entity? Describe the difference between required and optional attributes. What is a composite attribute? Describe and explain Relationships. What are Primary Keys? What are...

Q:

Business Database Systems 4283 Chapter 1: What is a legacy system? Explain what a repository is. Who is E. F. Codd? What did he do in the 1970s? What is an organized collection of logically related...

Q:

In a supertype / subtype hierarchy, subtypes that are lower in the hierarchy inherit attributes from not only their immediate supertype but from all _ _ _ _ _ _ _ _ in the hierarchy.

Q:

In a supertype / subtype hierarchy, subtypes that are lower in the hierarchy inherit attributes from not only their immediate supertype but from all in the hierarchy. constraints dimensions subtypes...

Q:

In a supertype / subtype hierarchy, subtypes that are lower in the hierarchy inherit attributes from not only their immediate supertype but from all in the hierarchy. constraints dimensions subtypes...

Q:

If the wavelength of incident light changes from 300 nm to 400 m, then find the change in stopping potential. If the work function of metal = 2.5 eV ? (1) 1.03 ev (2) 2.10 ev (3) 1.85 ev (4) 2.03 eV

Q:

Marta Johns is the Division Controller and Kevin Deere is the Division Vice President of Tuffy Tractor, Inc. Due to pressures to meet earnings estimates for 2011, Deere instructs Johns to record as...

Q:

Select all of the ways in which full - service brokers are different from discount brokers. Multiple select question. Can execute both purchases and sales Offer additional services such as tax...

Q:

Impact of Transactions Involving Inventories on Statement of Cash Flows From the following list, identify whether the change in the account balance during the year is added to (A) or deducted from...

Q:

Figure shows a lattice structure of generalization and specialization. For entity sets A, B, and C, explains how attributes are inherited from the higherlevel entity sets X and Y. Discuss how to...

Q:

Draw the UML equivalents of the E-R diagrams.

Q:

Consider two separate banks that decide to merge. Assume that both banks use exactly the same E-R database schema?the one in Figure below (This assumption is of course highly unrealistic; we consider...

Q:

Write a while loop that repeatedly asks the user for a number until exactly 3 odd numbers have been given. (Python)

Q:

Analyse and discuss the recent financial performance Vodafone Group Plc (the last five years) of your company. Your analysis must compare your company to one other listed company operating in the...

Q:

Indicate whether the sentence or statement is true or false. 23. Speculative risk is uninsurable. 24. Pure risk involves only a chance of a loss. 25. A company that requires only cash in dealing with...