sec@ora10g> create table test1 ( a number primary key, b number not null);
Table created.
sec@ora10g> desc test1;
Name Null? Type
———————- ——– ——————
A NOT NULL NUMBER
B NOT NULL NUMBER
sec@ora10g> insert into test1 values (1,1);
1 row created.
sec@ora10g> insert into test1 values (2,2);
1 row created.
sec@ora10g> COMMIT;
Commit complete.
sec@ora10g> create table test2 as select * from test1;
Table created.
sec@ora10g> desc test2;
Name Null? Type
——————— ——– ——————
A NUMBER
B NOT NULL NUMBER
sec@ora10g> select * from test1;
A B
———- ———-
1 1
2 2
sec@ora10g> select * from test2;
A B
———- ———-
1 1
2 2
