define null values in some cases a particular
Define null values.
In some cases a particular entity might not have an applicable value for an attribute or if we do not know the value of an attribute for a particular entity. In these cases null value is used.
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define single valued and multivalued attributes single valued attributes attributes with a single value for a particular entity are known as
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define null values in some cases a particular entity might not have an applicable value for an attribute or if we do not know the value of an
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