Use Datalog to ?nd all students who took all classes ever o?ered by Professor Joe Public.

What will be an ideal response?



Answer(?SN) :- Student(?Id,?SN,?Addr,?Status),

                        not StudWhoDidNotTakeSomeClass(?Id).

StudWhoDidNotTakeSomeClass(?Id) :-

                     Student(?Id,?SN,?Addr,?Status),

                     Teaching(?PId,?Crs,?Sem),

                     Professor(?PId,’Joe Public’,?Dept),

                     not TookClass(?Id,?Crs,?Sem).

TookClass(?Id,?Crs,?Sem) :- Transcript(?Id,?Crs,?Sem,?Gr).

Computer Science & Information Technology

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