1. UML
UML to Relations

2. High-Level Database Design Model
UML to Relations
High-Level Database Design Model
User-friendly (graphical) specification language
Translated into model of DBMS

3. Unified Modeling Language (UML) 5 concepts
UML to Relations
Unified Modeling Language (UML)
Data modeling subset
5 concepts
Classes
Associations
Association Classes
Subclasses
Composition & Aggregation
Designs can be translated to relations automatically
Provided every “regular” class has a key

4. UML to Relations: Classes
Every class becomes a relation; pk  primary key

5. UML Data Modeling: 5 concepts Classes Associations Association Classes
UML to Relations
UML Data Modeling: 5 concepts
Classes
Associations
Association Classes
Subclasses
Composition & Aggregation

6. UML to Relations: Associations Relation with key from each side

7. Keys for Association Relations Depends on multiplicity
UML to Relations
Keys for Association Relations
Depends on multiplicity

8. Association Relation Always Needed? Depends on multiplicity
UML to Relations
Association Relation Always Needed?
Depends on multiplicity

9. UML Data Modeling: 5 concepts Classes Associations Association Classes
UML to Relations
UML Data Modeling: 5 concepts
Classes
Associations
Association Classes
Subclasses
Composition & Aggregation

10. UML to Relations: Association Classes
Add attributes to relation for association

11. UML to Relations
Self-Associations

12. UML to Relations
Self-Associations

13. UML Data Modeling: 5 concepts Classes Associations Association Classes
UML to Relations
UML Data Modeling: 5 concepts
Classes
Associations
Association Classes
Subclasses
Composition & Aggregation

14. Subclasses UML to Relations
1) Subclass relations contain superclass key + specialized attrs.
2) Subclass relations contain all attributes
3) One relation containing all superclass + subclass attrs.
Best translation may depend on properties

15. UML to Relations
Subclasses – Example

16. UML Data Modeling: 5 concepts Classes Associations Association Classes
UML to Relations
UML Data Modeling: 5 concepts
Classes
Associations
Association Classes
Subclasses
Composition & Aggregation

17. Composition & Aggregation
UML to Relations
Composition & Aggregation

18. UML: High-Level Database Design Model
UML to Relations
UML: High-Level Database Design Model
User-friendly graphical specification language
Designs translated to relations automatically