Os comandos SQL create table R (a int, b int) create table S (c int, d int) insert into R values(1,2) insert into R values(2,3) insert into R values(2,3) insert into R values(3,5) insert into R values(4,1) insert into S values(1,2) insert into S values(2,1) insert into S values(2,3) insert into S values(3,5) select r.a,r.b from R where not exists (select * from S where s.c=r.a and s.d=r.b) Produzem um resultado que, além da linha de títulos, contém: