lpad&rpad
lpad( string, padded_length, [ pad_string ] ) string: 准备被填充的字符串 padded_length: 填充之后的字符串长度 pad_string: 填充字符串，是个可选参数 RPAD：从右边开始填充，用法同LPAD。 1、LPAD函数：oracle数据库函数，是从左边起对指定的字符串进
lpad( string, padded_length, [ pad_string ] )
string:
准备被填充的字符串
padded_length:
填充之后的字符串长度
pad_string:
填充字符串，是个可选参数
RPAD：从右边开始填充，用法同LPAD。
1、LPAD函数：oracle数据库函数，是从左边起对指定的字符串进行指定的字符填充。
实例一：SQL> select lpad('xxvvv',4)||'AAA'||'BBB' from dual;
LPAD('XXVVV',4)||'AAA'||'BBB'
-----------------------------
xxvvAAABBB
SQL> select lpad('xxv',4)||'AAA'||'BBB' from dual;
LPAD('XXV',4)||'AAA'||'BBB'
---------------------------
xxvAAABBB
从左边开始对字符串'AAA'||'BBB'进行填充，填充长度为4（‘xxvvv’是填充字符串，4是填充字符串的长度，若填充字符串长度超过4，则截取前4位填充，若不超过4，则全部填充）
实例二：SQL> select lpad('aaabbb',10,'x') from dual;
LPAD('AAABBB',10,'X')
---------------------
xxxxaaabbb
从左边开始对字符串'AAABBB'进行填充（‘aaabbb’：被填充字符串，10：填充后字符串长度，‘x’：填充字符串，填充后的字符串长度为10）
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