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Introduction to Database System

Introduction to Database System
In SQL, which command is used to make permanent changes made by statements issue since the beginning of a transaction?

PACK
COMMIT
SAVE
ZIP

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Introduction to Database System
In a relation, the order of the columns does not matter.

True
False

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Introduction to Database System
In which of the following can many entity instances of one type be related to many entity instances of another type?

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

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Introduction to Database System
A network schema

restricts the structure to a one-to-many relationship
permits many-to-many relation¬ships
stores data in tables
All of the listed here

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Introduction to Database System
A recursive relationship is a relationship between an entity and ________ .

an instance entity
an archetype entity
itself
a subtype entity

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Introduction to Database System
A subtype entity is a special case of another entity called a supertype entity.

False
True

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