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Introduction to Database System

Introduction to Database System
Relationship classes are associations between entity classes.

True
False

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Introduction to Database System
A file that is organized in uniform format is formally referred to as a _____ or a database file.

Database
Document
None of these
Structured data file
Record

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Introduction to Database System
The master list of an indexed file

has a number assigned to each record
both (b) and (c)
None of these
is sorted in ascending order
contains only a list of keys and record numbers

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Introduction to Database System
The functional dependency R → S means that the value of S can be determined when we are given a value of R.

False
True

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Introduction to Database System
In SQL, which command is used to remove a stored function from the database?

DROP FUNCTION
REMOVE FUNCTION
None of these
ERASE FUNCTION
DELETE FUNCTION

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Introduction to Database System
In a _____ a parent record type can be linked to one or more "child" record types, but a child record type can have only one parent.

Hierarchical database
Network database
Relational database
Distributed database

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