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Introduction to Database System

Introduction to Database System
Entities of a given type are grouped into a(n):

database.
ER
entity class.
attribute.

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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:

A →
A →
A → (B,C).
(B,C) →

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Introduction to Database System
Which command is used to remove a table from the database in SQL?

UNATTACH TABLE
ERASE TABLE
DELETE TABLE
DROP TABLE

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

False
True

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Introduction to Database System
Which of the following products implemented the CODASYL DBTG model?

IDMS
dBase-II
DB2
R:base

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Introduction to Database System
Keys made up of two or more attributes are called composite keys.

False
True

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