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Introduction to Database System

Introduction to Database System
In SQL, which command(s) is(are) used to redefine an index's future storage allocation

MODIFY INDEX
REDEFINE INDEX
ALTER INDEX
None of these
DO INDEX

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

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.
No two rows in a table may be identical.

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Introduction to Database System
Which type of entity is related to two or more associated entities that each contain specialized attributes that apply to some but not all of the instances of the entity?

Subtype entity
Supertype entity
Archetype entity
Instance entity

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Introduction to Database System
Sort/report generators

require more disk space than index/report generators
do not need to sort before generating a report
none of the listed here
are faster than index/report generators

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Introduction to Database System
A key:

identifies a row.
can only be one column.
must always be composed of two or more columns.
identifies a column.

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Introduction to Database System
One data dictionary software package is called

TOTAL
any of the above
DB/DC dictionary
None of these
ACCESS

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