oracle调整表中列顺序

有一个哥们提出一个问题：

有个表，创建时候的列顺序是a,b,c

如何使用select * 的时候，让列的显示顺序是a,c,b 而且任性地必须使用select *来查询，且不能重建表。

 

假设有个表test

SQL> select * from test;

A                    B                    C
-------------------- -------------------- --------------------
you                  pig                  are

SQL> select a,c,b from test;

A                    C                    B
-------------------- -------------------- --------------------
you                  are                  pig

SQL> 

 

按照其要求，应该是以下显示方式：

SQL> select * from test;

A                    C                    B
-------------------- -------------------- --------------------
you                  are                  pig

SQL>

 

可以通过修改sys.col$表来改变表中列的顺序

SQL> SELECT owner,object_name,object_id FROM ALL_OBJECTS WHERE OBJECT_NAME='TEST';

OWNER                          OBJECT_NAME                     OBJECT_ID
------------------------------ ------------------------------ ----------
SYS                            TEST                                88842

SQL> select obj#,col#,name from sys.col$ where obj# =88842 order by col#;

      OBJ#       COL# NAME
---------- ---------- ------------------------------
     88842          1 A
     88842          2 B
     88842          3 C

SQL> update sys.col$ set col#=2 where obj# =88842 and name='C';

1 row updated.

SQL> update sys.col$ set col#=3 where obj# =88842 and name='B';

1 row updated.

SQL> commit;

Commit complete.

SQL> select * from test;

A                    C                    B
-------------------- -------------------- --------------------
you                  are                  pig

SQL>