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Introduction to Database System

Introduction to Database System
Entity instances are associated by relationship classes.

False
True

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Introduction to Database System
The relational database model was created by E.F. Codd.

False
True

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Introduction to Database System
In SQL, which command is used to make permanent changes made by statements issue since the beginning of a transaction?

ZIP
COMMIT
PACK
SAVE

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Introduction to Database System
A _____ database does not use pointers or physical links, but instead finds related records by examining the contents of fields.

Object-Oriented
Hierarchical
Relational
None of these
Network

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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 → (B,C).
A →

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Introduction to Database System
It is more accurate to define a _____ as a variety of different record types that are treated as a single unit

Table
Flat File
Record
None of these
Database

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