PowerDesigner OLAIS

Sample Class

Go to:

Extending the logical model

• Normalization 1NF ~ 2NF ~ 3NF
• Inheritance hierarchies for generalization and specialization
• Optional parents as super-types
• Check constraints
• Externalizing domains through entities

Reviewing relationship types

• One-to-One do not exist (except as sub-type)
• Many-to-Many must be converted
• One-to-Many is the only valid relational form

Using submodels

• Object-to-Submodel is Many-to-Many
• Unlimited submodels
• Create and update via push from or pull to
• Definitions are global
• Graphic properties are local
• Each object exists only once

General features of all PowerDesigner modules

• Tool palette review
• Tool bar checkoff
• Right mouse as an alternative
• Main menu special features
  • Arrange; Disposition; Arrange end points
  • Edit Synonym, Duplicate, Copy

See Also

© © 1997-2000 Applied Information Science