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Introduction to Database System

Introduction to Database System
Entities use identifiers while tables use keys.

False
True

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Introduction to Database System
An entity is something that can be identified in the user's work environment; something that the users want to track.

False
True

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Introduction to Database System
The way a particular application views the data from the data base that the application uses is a :

None of these
subschema
relational model
schema
module

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Introduction to Database System
SQL stands for ________ .

Sequential Question Language
Sequential Query Language
Structured Query Language
Structured Question Language

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Introduction to Database System
Every time attribute A appears, it is matched with the same value of attribute B, but not the same value of attribute C. Therefore, it is true that:

(B,C) →
A →
A →
A → (B,C).

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Introduction to Database System
A large computer information system maintains many different computer files. Which amongst them is called a perpetual file?

Update file
Specialized file
Master file
Log file

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