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' |
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 |
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' |
参考：http://www.cnblogs.com/fenglie/articles/4409208.html
总结
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原文链接：http://www.cnblogs.com/duhuo/p/6250338.html
