selcet 重命名3种方式

1，直接跟别名

SQL> select ku_id wk_user_id from wk_t_user;

WK_USER_ID
----------
         1
         2
        11

2，as+别名

SQL> select ku_id as wk_user_id from wk_t_user;

WK_USER_ID
----------
         1
         2
        11

3，为 保持大小写as+"别名"

SQL> select ku_id as "wk_user_id" from wk_t_user;

wk_user_id
----------
         1
         2
        11