Relational database means the relationship between different databases. In relational database user can store and access all the data through the tables which are related to each other. Relationship between the store data is called base relations and implementation of it is called as tables. Whereas, relations which don’t store the data, but can be found out by applying relational operations on other relations are called as derived relations. When these are implemented they are termed as views or queries.
Derived relations are more useful then base relation, as they can have more information from many relations, but they act as a single relation.