Oracle数据库表中字段顺序的修改方法

create table test1
(id varchar2(20) not null);

alter table test1
add (name varchar2(30) default ‘无名氏' not null);

alter table test1
add (name varchar2(30) default ‘无名氏' not null,

age integer default 22 not null,

has_money number(9,2)

);

--新建临时表以存储正确的顺序
create table A_2 as select （column1,colum2,……A表中的顺序） from A_1 ;

--删除表A_1
drop table A_1;

--新建A_1并从A_2表中赋予其正确的顺序和值
create table A_1 as select * from A_2;

--删除临时表A_2
drop table A_2;

select object_id
 from all_objects
 where owner = 'ITHOME'
 and object_name = 'TEST';

select obj#, col#, name 
 from sys.col$ 
 where obj# = '103756' order by col#

update sys.col$ set col#=2 where obj#=103756 and name='AGE';
update sys.col$ set col#=3 where obj#=103756 and name='NAME';