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Introduction to Database System

Introduction to Database System
A relation is considered a:

three-dimensional table.
Column.
two-dimensional table.
one-dimensional table.

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Introduction to Database System
Characteristic(s) of a distributed MIS structure is

interactive sharing of the workload
computers supporting local DP operations
None of these
All of these
a multiprocessing environment

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Introduction to Database System
In the relational model, relationships between relations or tables are created by using:

foreign keys.
candidate keys.
composite keys.
determinants.

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Introduction to Database System
Which of the following is not a restriction for a table to be a relation?

No two rows in a table may be identical.
The columns must be ordered.
All of the entries in any column must be of the same kind.
The cells of the table must contain a single value.

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Introduction to Database System
A relation is a two-dimensional table.

False
True

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Introduction to Database System
An audit trail

can be used to restore lost information
is the recorded history of operations performed on a file
is used to make back-up copies
All of the listed here

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