oracle sqlplus中column格式化命令之heading用法

SQL> create table t_sqlplus(a int,b int);

Table created.

--格式化a列為列寬4且標題為a_heading
SQL> column a for 9999 heading 'a_heading'
SQL> column b for 9999 heading 'b_heading'

--插入資料方可看到column格式化效果
SQL> insert into t_sqlplus values(1,1);

1 row created.

SQL> commit;

Commit complete.
--顯示a,b列為a_heading and b_heading
SQL> select a,b from t_sqlplus;

a_heading b_heading
--------- ---------
        1         1
--如重新命名a,b列
SQL> select a as a_new,b as b_new from t_sqlplus;

     A_NEW      B_NEW
---------- ----------
         1          1
---可對重新命名用column格式化
SQL> column a_new for 9999 heading 'a_heading'
SQL> column b_new for 9999 heading 'b_heading'
SQL> select a as a_new,b as b_new from t_sqlplus;
--依舊可以達到上述的效果
a_heading b_heading
--------- ---------
        1         1