oracle 中的Ipad()函数

本文基于转载:

lpad函数从左边对字符串使用指定的字符进行填充。lpad意思是从左边填充的意思。

  语法格式如下:

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,也就是该函数返回的字符串长度,如果这个数量比原字符串的长度要短,lpad函数将会把字符串截取成从左到右的n个字符;

pad_string:填充字符串,是个可选参数,这个字符串是要粘贴到string的左边,如果这个参数未写,lpad函数将会在string的左边粘贴空格。

示例1:

   select lpad('abcde',10,'x') from dual;

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示例2:

 select lpad('abcde',10,'oq') from dual;

aaarticlea/png;base64,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" alt="" />

 示例3:

select lpad('abcde',2) from dual;

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 与lpad函数对应的是rpad函数,rpad函数从右边对字符串使用指定的字符进行填充,语法格式与lpad格式相同。

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