drop table test
/

create table test
(
  x   int ,
  y   int ,
  cpt int
)
/

insert into test values (1,1,null);
insert into test values (1,2,null);
insert into test values (1,3,null);

insert into test values (2,1,null);
insert into test values (2,2,null);
insert into test values (2,3,null);

insert into test values (3,1,null);
insert into test values (3,2,null);
insert into test values (3,3,null);