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Introduction to Database System

Introduction to Database System
Which of the following is not characteristic of a relational database model?

complex logical relationships
records
treelike structure
tables

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Introduction to Database System
An ID-dependent entity is an entity whose identifier is a composite identifier where no portion of the composite identifier is an identifier of another entity.

True
False

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Introduction to Database System
The functional dependency R → S means that the value of S can be determined when we are given a value of R.

True
False

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Introduction to Database System
Given the functional dependency R → S , R is called the determinant.

False
True

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Introduction to Database System
In order to use a record management system

All of these
You need to understand the low-level details of how information in stored
Both (a) and (b)
None of these
You need to understand the model the record management system uses.

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Introduction to Database System
Which type of entity represents a logical generalization whose actual occurrence is represented by a second, associated entity?

Archetype entity
Instance entity
Subtype entity
Supertype entity

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