ORACLE的lpad函数、rpad函数用法

ORACLE的lpad函数、rpad函数用法
语法：select lpad('12345678',1,'0') from dual;
返回字符串‘12345678’的从左边长度为1的字符串，如果不够，左边补‘0’
语法：select rpad('12345678',1,'0') from dual; 
返回字符串‘12345678’的从左边长度为1的字符串，如果不够，右边补‘0’
select rpad('12345678',1,0) from dual;
--------
1
select lpad('12345678',1,0) from dual;
--------
1
select rpad('12345678',10,0) from dual;
-------
1234567800
select lpad('12345678',10,0) from dual;
-------
0012345678