oracle調整表中列順序

有一個哥們提出一個問題：

有個表，創建時候的列順序是a,b,c

如何使用select * 的時候，讓列的顯示順序是a,c,b 而且任性地必須使用select *來查詢，且不能重建表。

 

假設有個表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，應該是以下顯示方式：

SQL> select * from test;

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

SQL>

 

可以通過修改sys.col$表來改變表中列的順序

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>