Local-as-View (LAV)
Book: ISBN, Title, Genre, Year
R1
R2
R3
R4
R5
Author: ISBN, Name
R1(x,y,n) :- Book(x, y, z, t), Author(x, n), t < 1970
R5(x,y) :- Book(x,y,”Humor”)
Books before 1970
Humor books