Oracle select --字元函數：TRANSLATE(string,from_str,to_str)__C語言

 --字元函數：
  
1、TRANSLATE(string,from_str,to_str)  
 
    返回將（所有出現的）from_str中的每個字元替換為to_str中的相應字元以後的string。TRANSLATE是REPLACE所提供的功能的一個超集。如果from_str比 to_str長，那麼在from_str中而不在to_str中的額外字元將從string中被刪除，因為它們沒有相應的替換字元。to_str不可為空。Oracle將Null 字元串解釋為NULL，並且如果TRANSLATE中的任何參數為NULL，那麼結果也是NULL。

樣本：
SQL> select translate('kvenchou_zhou','kvenchou','12345678') from dual;

TRANSLATE('KV                                                                  
-------------                                                                  
12345678_z678 

SQL> select translate('uokvenchuuuuuooooou','kvu','zh') from dual;

TRANSLATE('U                                                                   
------------                                                                   
ozhenchooooo                                                                   

SQL> select translate('uokvenchuuuuuooooou','kvo','zhuo') from dual;

TRANSLATE('UOKVENCH                                                            
-------------------                                                            
uuzhenchuuuuuuuuuuu

2、LTRIM(X,Y)

ltrim(x,y) 函數是按照y中的字元一個一個截掉x中的字元，並且是從左邊開始執行的，只要遇到y中有的字元, x中的字元都會被截掉, 直到在x的字元中遇到y中沒有的字元為止函數命令才結束 .

樣本:
SQL> select ltrim('10900119224319','109') from dual;

LTRIM(                                                                         
------                                                                         
224319                                                                         

SQL> select ltrim('109005119224319','109') from dual;

LTRIM('109                                                                     
----------                                                                     
5119224319       

3、RTRIM(X,Y) 相對於LTRIM

樣本：
SQL> select rtrim('kvenchuuuuuooooou','ou') from dual;

RTRIM(                                                                         
------                                                                         
kvench                                                                         

SQL> select rtrim('kvenchuuuuuoozooou','ou') from dual;

RTRIM('KVENCHU                                                                 
--------------                                                                 
kvenchuuuuuooz