PPT Slide

• POSTGRES Data Model (cont. 3 )
  

• Version 1
  

• Record ?
  • Collection of base constructed types

• Version 2.1
  

• Classes
  • Collection of objects
  • Real
  • Derived
  • Version

Notes:

• Real: stored in the Database
  

• Derived: view/virtual- not stored in database, but can be materialized when necessary

• Version- differential relative to parent class. Hypothetical version of a class

• Examples with respect to Rule system.

• Ex: