This document discusses different types of database data models including conceptual, logical, and physical models. A conceptual model focuses on important entities and their relationships without attributes or keys. A logical model specifies all entities, attributes, primary keys, and foreign keys and includes normalization. A physical model specifies tables, columns, data types, primary keys, and foreign keys.

1. DATABASE DATA MODELS
DESIGN USING VISIO
Conceptual
Logical
Physical
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2. Table of Contents
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 Relationship Between Database - Entities - Attributes
 Data Models Hierarchy
 Conceptual Data Model
 Logical Data Model
 Physical Data Model
 D M Features Comparison

3. Database Entities Attributes
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Relationship

4. Data Models Hierarchy
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Hierarchy

5. Conceptual Data Model
Features of conceptual data
model include:
 Includes the Important
Entities and the
Relationships among them.
 No Attribute is specified.
 No Primary key is specified.
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Conceptual

6. Logical Data Model
Features of a logical data model
include:
 Includes All Entities and
relationships among them.
 All Attributes for each entity are
specified.
 The Primary Key for each entity is
specified.
 Foreign Keys (keys identifying the
relationship between different
entities) are specified.
 Normalization occurs at this level.
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Logical

7. Physical Data Model
Features of a physical data
model include:
 Specification All Tables and
Columns.
 The Primary Key for each
entity is specified.
 Foreign Keys are specified.
 Column Names are
specified.
 Column Data Types are
specified
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Physical

8. D M Features Comparison
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Comparison