Connected to Oracle Database 18c Enterprise Edition Release 18.0.0.0.0 
Connected as big3@//server:11521/XE

SQL> drop table test;

Table dropped


SQL> create table test (id number, ida number, idb number);

Table created


Sin
SQL> insert into test values(1, 100, 200);

1 row inserted


SQL> insert into test values(2, 200, 200);

1 row inserted



SQL> insert into test values(100, null, null);

1 row inserted


SQL> insert into test values(200, null, null);

1 row inserted


SQL> commit;

Commit complete


SQL>