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Introduction to Database System

Introduction to Database System
The XML family of standards is very important in database processing today.

False
True

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Introduction to Database System
In SQL, which command(s) is(are) used to enable/disable a database trigger?

ALTER TRIGGER
CHANGE USER
MODIFY USER
All of the listed here

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Introduction to Database System
A recursive relationship is a relationship between an archetype and an instance of that archetype.

False
True

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

False
True

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Introduction to Database System
Which of the following refers to something that can be identified in the user's work environment, something that the users want to track?

Attribute
Relationship
Identifier
Entity

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Introduction to Database System
Which command is used to select distinct subject (SUB) from the table (BOOK)?

SELECT ALL FROM BOOK
SELECT SUB FROM BOOK
None of these
SELECT DISTINCT SUB FROM BOOK
All of these

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