define null valuesin some cases a certain entity
Define null values.
In some cases a certain entity may not have an applicable value for an attribute or if we do not know the value of an attribute for a certain entity. In these cases null value is used.
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what are stored and derived attributesstored attributes the attributes keeps in a data base are known as stored attributesderived attributes the
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define null valuesin some cases a certain entity may not have an applicable value for an attribute or if we do not know the value of an attribute for
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define the terms i entity type ii entity setentity type an entity type describes a collection of entities that have the similar attributesentity set
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