a model where the data and the operations to be

performed on the data are both stored in the database.

a model which supports

many-to-many relationships where data may be accessed by following several

paths

similar to a relational model,

but whereas a relational model stores data in a two-dimensional table, an

object-oriented model stores data in the database.

Entity Relationship Database Models

Flat

Model

Object-Relational Database Model

Semi-structured Model

Absolute references

always refer to the same cell, while relative references can change

Relative references always refer to the same cell, while

absolute references can change

Neither absolute nor

relative references always refer to the same cell

Both absolute and relative references always refer to the

same cell

Synchronous chat transcripts

Existing accounting and

management systems (CRM, ERP, etc…)

Emails

Discussion Forums

Relational model

Network model

Multi-dimensional model

 Hierarchical model