ldl++(39)> query empProj(X,Y)
query empProj(X,Y)

Querying : empProj(X,Y) ... 
        (bob, (940101, 940701))
        (bob, (950101, 970101))

        The number of records is 2.
ldl++(40)> query empProj1(X,Y,Z)
query empProj1(X,Y,Z)

Querying : empProj1(X,Y,Z) ... 
        (bob, r_d, (940101, 940701))
        (bob, salesDept, (950101, 951001))
        (bob, r_d, (951001, 960201))
        (bob, humanResource, (960201, 970101))

        The number of records is 4.
ldl++(41)> query empProj2(X,Y,Z)
query empProj2(X,Y,Z)

Querying : empProj2(X,Y,Z) ... 
        (bob, 8000, (940101, 940701))
        (bob, 6000, (950101, 950601))
        (bob, 7000, (950601, 970101))

        The number of records is 3.