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Introduction to Database System

Introduction to Database System
The primary key is selected from the:

composite keys.
foreign keys.
determinants.
candidate keys.

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

True
False

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Introduction to Database System
A database management system

allows simultaneous access to multiple files
can do more than a record management system
None of the listed here
Both of the listed here

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Introduction to Database System
Which command(s) is(are) used to redefine a column of the table in SQL ?

all of the listed here
DEFINE TABLE
MODIFY TABLE
ALTER TABLE

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Introduction to Database System
Related fields in a data base are grouped to form

data file
menu
data record
None of these
bank

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Introduction to Database System
To have a file hold a list, it is necessary to

identify the name, width and type of the fields of each record.
decide which fields will be used as sort or index keys
All of the listed here
identify the records in the list

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