This data model is introduced by C.F.Codd in 1970. Currently, it is considered as the most widely used data model.
The relational model has provided the basis for:
- Research on theory of data/relationship/constraint
- Numerous database design methodologies
- The standard database access language SQL
- Almost all modern commercial database management systems
The relational data model describes the world as “a collection of inter-related relations (or tables) “