Database Glossary Terms Beginning With The Letter N
A candidate key that describes the subject of the table, such as the name or serial number. The field meets the requirements for a primary key and can be used to uniquely identify the record.
A group of computers that are connected to each other for the purpose of communication.
The criterion by which the tables in a database are measured with respect to adherence to relational data modeling principles.
An unknown; the absence of data without knowing if there is valid data as contrasted with an Empty String or Zero Length String (ZLS).