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Introduction to Database System

Introduction to Database System
SQL stands for ________ .

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

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Introduction to Database System
In any hierarchy of data organization, the smallest entity to be processed as a single unit is called

data file
data field
database
data record
None of these

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Introduction to Database System
A key:

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

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Introduction to Database System
A primary key is a composite key that was selected to be the main identifier for the relation.

False
True

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Introduction to Database System
In which of the following is a single-entity instance of one type of related to a single-entity instance of another type?

One-to-One Relationship
Many-to-Many Relationship
One-to-Many Relationship
Composite Relationship

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Introduction to Database System
For some relations, changing the data can have undesirable consequences called:

transitive dependencies.
modification anomalies.
referential integrity constraints.
normal forms.

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