I think you are referring table Resource not Job.
Below code sample will show those unique Resource Name -
LOCAL GetUniqueResources()
Resource.RESET;
Resource.SETCURRENTKEY("Name");
Resource.SETRANGE(Type,Resource.Type::Person);
IF Resource.FINDSET THEN REPEAT
IF PrevResourceName = Resource.Name THEN
MESSAGE('%1',Resource.Name);
PrevResourceName := Resource.Name;
UNTIL(Resource.NEXT=0);
I hope it helps.