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Introduction to Database System

Introduction to Database System
The language used in application programs to request data from the DBMS is referred to as the

All of the listed here
DDL
query language
DML

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Introduction to Database System
Which of the following is not a logical data-base structure?

relational
network
tree
chain

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Introduction to Database System
A key is a group of one or more attributes that uniquely identifies a row.

False
True

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Introduction to Database System
All instances of an entity class have the same attributes.

True
False

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Introduction to Database System
One of the reasons why OODBMSs have not been widely used for business information systems is that OOP is obsolete.

False
True

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Introduction to Database System
In SQL, which command is used to select only one copy of each set of duplicable rows

All of these
SELECT UNIQUE
None of these
SELECT DISTINCT
SELECT DIFFERENT

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