A deductive database system is a
database system that includes capabilities to define (deductive) rules, which
can deduce or infer additional information from the facts that are stored in a
database.
Specification:
n Facts: Are specified in a manner similar to the way relations are specified,
except that it’s not necessary to include the attribute names.
n Rules: This specifies virtual relations that are not actually stored but can be
formed from the facts by applying inference mechanisms.
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