create table t1(a number);

insert into t1 values (1);
insert into t1 values (2);
insert into t1 values (3);
insert into t1 values (4);


create table t2(b number);

insert into t2 values (1);
insert into t2 values (2);
insert into t2 values (3);
insert into t2 values (5);

commit;

clear screen