______ is the special attribute value that indicates an unknown or missing value.

Anything in the real world with independent existence is called

___________ are known facts that can be recorded and which have implicit meaning.

The major elements of _________ are entities, attributes, identifiers and relationships that are used to express a reality for which a database is to be designed.

_________ refers to data that have been processed and organised in a form, which is suitable for decision-making.

A ________ is a shared collection of interrelated data tables, files or structures, which are designed to meet the varied informational needs of an organisation.

____________ involves the technique of collecting, sorting, relating, interpreting and computing data items.

__________ is a collection of programs that enables users to create and maintain a database.

_________ is an entity, which expresses various support documents that may be attached with a particular voucher of a transaction.

An Entity Type is described by a set of attributes called