A deductive database system is a database system that contains so-called deductive rules like
connected(x,y) :- connected(x,z),connected(z,y).
See also the Wikipedia entry on Datalog.
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The system that is used to make a deduction that is stored in the database is called deductive database. To specify queries, facts and rules it uses datalog as the typical language.
the advantages of deductive method
the answer between the two:)deductive: means something...no questions about itinductive: questionable
Inductive reasoning varies from deductive reasoning as follows: 1) inductive reasoning is a reason supporting an argument and 2) deductive reasoning is an argument against an argument.
The only disadvantage is when the database creater is less than professional in how the database is set up. If you use a numeric as the unique identifier for the database then the database can quickly become both useful and huge.