最近因为工作的需求，需要对mysql中数字进行格式化，但发现网上的资料较少，索性自己总结一下，方便自己也帮助有需要的朋友们，下面话不多说，来一起看看详细的介绍：
一、format函数：
格式化浮点数 format(number, length);
介绍：Formats the number X to a format like '#,###,###.##', rounded to D decimal places, and returns the result as a string. If D is 0, the result has no decimal point or fractional part. D should be a constant value.
示例代码
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mysql> SELECT FORMAT(12332.123456, 4);
-> '12,332.1235'
mysql> SELECT FORMAT(12332.1,4);
-> '12,332.1000'
mysql> SELECT FORMAT(12332.2,0);
-> '12,332'
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二、rpad 和 lpad 给定位数，不足补充自定义字符
RPAD:
Returns the string str,right-padded with the string padstr to a length of len characters. If
str is longer than len, the return value is shortened to len characters.
示例代码
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mysql> SELECT RPAD('hi',5,'?');
-> 'hi???'
mysql> SELECT RPAD('hi',1,'?');
-> 'h'
mysql>SELET RPAD(12, 5 ,0);
->12000
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This function is multi-byte safe.
LPAD:
Returns the string str, left-padded with the string padstr to a length of lencharacters. If str is longer than len, the return value is shortened to lencharacters.
示例代码
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mysql> SELECT LPAD('hi',4,'??');
-> '??hi'
mysql> SELECT LPAD('hi',1,'??');
-> 'h'
mysql>SELECT LPAD(12, 5 , 0)
->'00012'
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参考：http://www.cnblogs.com/fenglie/articles/4409208.html
总结
以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作能带来一定的帮助，如果有疑问大家可以留言交流，谢谢大家对服务器之家的支持。
原文链接：http://www.cnblogs.com/duhuo/p/6250338.html