Database.... Mark each question True or False and explain why you made your choi

Question

Database.... Mark each question True or False and explain why you made your choice.

. Bottom-up development generally does not produce useful systems quickly.

· An entity is something that the users want to track.

· An identifier can consist of only one attribute.

· Subtype entities have the same identifier as their supertype.

· The entities in subtypes inherit the attributes of the supertype entity class.

· The attributes of a semantic object are known as semantic object attributes.

· A functional dependency is a relationship between or among attributes.

· The selection of the attributes to use for the key is determined by the database programmers.

Explanation / Answer

If you post more than 4 parts in a question, as per chegg guidelines I have to solve only 4 parts.

(a) False

bottom up approach produce a good systems as in this we fist work on small parts and then work our way up to arger parts. So, the system is better as it is easier to build smaller parts and they have less errors.

(b) True

Each row in a table is an entity and user wants to access the entries in order to access the information in the database. So, a user want to track entities.

(c) False

There can be more than 1 attribute associated with an identifier.

(d) False

The identifiers of the subtypes can be different than the supertypes.

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