( data models )

( data models )

https://www.youtube.com/watch?v=mH1kzFbGRfQ&spfreload=10

3 1. (structural) 2. (manipulative) 3. (a set of integrity ruler) (External Data Model) (conceptual Data Model) DBMS (Internal Data Model) DBMS

2 Conceptual Models Implementation ModelsConceptual Models Implementation Models

(Database Model)

1. 2. 3.

(Hierarchical database model) (Network database model) (Relation database model) (Object-Oriented database model) (Multidimensional database model)

Branch Staff

Branch Staff

(relation) (attribute) (domain) (tuple) (degree) (cardinality)

Relational Algebra Relational Calculus

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