1. UML
UML to Relations

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

3. UML Modeling Unified Modeling Language (UML) 5 concepts
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 Modeling UML to Relations: Classes
Every class becomes a relation; pk  primary key

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

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

7. UML Modeling
Keys for Association Relations
Depends on multiplicity

8. UML Modeling Association Relation Always Needed?
Depends on multiplicity

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

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

11. UML Modeling
Self-Associations

12. UML Modeling
Self-Associations

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

14. UML Modeling Subclasses
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 Modeling
Subclasses – Example

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

17. UML Modeling
Composition & Aggregation

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