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how many types of data models are there?
three types,they are object-based logic models,record-based logic models,and physical models.


  
Total Answers and Comments: 2 Last Update: May 08, 2009     Asked by: sudheer 
  
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March 21, 2006 20:00:31   
Culver_lake Member Since: March 2006   Contribution: 46    

RE: how many types of data models are there?

There are no standards in this area. Authors and theorists make it up as they go. The entity-relationship model (ER) has hundreds of derivitives (bachman chen ibm IDEF1x etc.). the most popular of the OO models is Unified Modeling Language (UML). Actually UML and IDEF1x are closest to becoming a standard that can support software products. Rational already has products and IDEF1x is the language of ERwin.

Don't be fooled by these variations. They all represent the same things you have to be very careful that you understand all of the non-standard symbols or you will surely make mistakes in interpreting what the pictures mean.


 
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May 08, 2009 03:44:36   
anushandilya123 Member Since: May 2009   Contribution: 7    

RE: how many types of data models are there?

Data Models:

Object based

Record based


Object Based:

Object Oriented

Entity Relationship Model


Record Based:

Relational

Network

Hierarchical


 
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