9.   List and explain the four levels of RDBMS classifications.

 

           

Fully Relational

Supports all relational algebra functions

 

Enforces Entity and Referential Integrity Rules

 

 

Relationally Complete

 

Supports all relational algebra functions

 

 

Does NOT support Integrity Rules

 

 

Minimally Relational

 

Supports only SELECT, PROJECT, and JOIN

 

Tabular

 

Supports only SELECT, PROJECT, and JOIN

 

User MUST define all access paths