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
免责声明：本站发布的内容（图片、视频和文字）以原创、转载和分享为主，文章观点不代表本网站立场，如果涉及侵权请联系站长邮箱：is@yisu.com进行举报，并提供相关证据，一经查实，将立刻删除涉嫌侵权内容。
