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Introduction to Database System

Introduction to Database System
A key:

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

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Introduction to Database System
After you _____ a record, many data management the environments require you to issue a command to save the changes you made.

Sort key
Update
Index
Delete

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Introduction to Database System
The main idea behind computer files is that it is convenient to

store information together
create them
access them
arrange them

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Introduction to Database System
A database design may be based on existing data.

True
False

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Introduction to Database System
The _____ command is used to allocates an extent for the table in SQL

None of these
MODIFY TABLE
MODIFY ALLOCATES
REDEFINE TABLE
ALTER TABLE

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Introduction to Database System
In a relational schema, each tuple is divided into fields called

Queries
Relations
Domains
All of the listed here

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