The data in a database is organized according to a database model. The model most commonly used today is the relational model. Other models such as the hierarchical model and the network model use a more explicit representation of relationships.
Source: http://en.wikipedia.org/wiki/Database
Below are free database courses that can be download free
- Syllabus
- 01. Intro to database
- 02. Relational Model
- 03. Entity Relationship Modeling
- 04. SQL Definition
- 05. More SQL Definition
- 06. SQL Select
- 07. More SQL Select
- 08. Yet More SQL Select
- 09. Missing Information
- 10. Normalization to 3NF
- 11. Physical Database Issues
- 12. Transaction and Recovery
- 13. Security and Integrity
- 14. Designing Database
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