If the attribute phone number is included in the relation all the values need not be entered into the phone number column. This type of entry is given as

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A DBMS (Database Management System) is a software application that helps create and manage databases. Popular DBMS are MySQL, Oracle, MongoDB, etc.  The sum total of the database, the DBMS and the associated applications can be referred to as a database system. Often the term "database" is also used loosely to refer to any of the DBMS, the database system or an application associated with the database. Existing DBMSs provide various functions that allow management of a database and its data which can be classified into four main functional groups: Data definition – Creation, modification... Show more

If the attribute phone number is included in the relation all the values need not be entered into the phone number column. This type of entry is given as