Present the data to the user as relations (a presentation in tabular form, i.e. as a collection of tables with each table consisting of a set of rows and columns); Provide relational operators to manipulate the data in tabular form.
present the data to the user as relations (a presentation in tabular form ie as a collection of tables with each table consisting of a set of rows and columns); provide relational operators to manipulate the data in tabular form