Stored and derived attributes, Database Management System

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Attributes that are directly kept in the data base.

For example, 'Birth date' attribute of a person.

Derived

Attributes that are not stored directly but can be derived from stored attributes are known as derived attributes. For instance, The years of services of a 'person' entity can be determined from the present date and the date of joining of the person. Likewise, total salary of a 'person' can be calculated from 'basic salary' attribute of a 'person'.

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