General IT terms::relational data model

type of logical data model giving the information as series of tables (relations) and attributes<br/>NOTE: It will have the following characteristics: 1. all attribute values are atomic; 2. all “tuples” (rows/occurrences) are distinct; 3. no part of the primary key may be null; 4. foreign key values will correspond to an existing primary key in another relation or be null.<br/><br/>