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Introduction to Database System

Introduction to Database System
Which of the following is NOT a basic element of all versions of the E-R model?

Attributes
Relationships
Primary keys
Entities

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Introduction to Database System
Every time attribute A appears, it is matched with the same value of attribute B, but not the same value of attribute C. Therefore, it is true that:

(B,C) →
A →
A →
A → (B,C).

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Introduction to Database System
A primary key is a composite key that was selected to be the main identifier for the relation.

False
True

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Introduction to Database System
The following are components of a database except ________ .

metadata
indexes
user data
reports

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Introduction to Database System
If a piece of data is stored in two places in the database, then

it can be more easily accessed
changing the data is one spot will cause data inconsistency
storage space is wasted
None of these
both (a) and (b)

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Introduction to Database System
A top-to-bottom relationship among the items in a database is established by a

Relational schema
Hierarchical schema
All of the listed here
Network schema

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