DBMS
What a Data Model Is
A data model is the set of concepts used to describe data, relationships, semantics and constraints. Models are grouped as high level, representationa...
Data Models
Hierarchical, network, relational, object oriented and object relational models, NoSQL concepts and how to choose between them.
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Notes
DBMS
Hierarchical and Network Data Models
The hierarchical model arranges records in a tree with one parent each; the network model allows many parents through a graph of sets. Both used physi...
DBMS
The Relational Model as a Data Model
The relational model stores everything in tables and connects them by matching values rather than pointers. That one decision delivers declarative que...
DBMS
Object Oriented and Object Relational Models
The object oriented model stores objects with identity, state and behaviour. The object relational model adds those ideas to a relational core, which...
DBMS
Comparing Data Models and Choosing One
A single comparison of hierarchical, network, relational, object oriented, object relational and NoSQL models, plus a practical method for choosing a...