mysql中格式化数字详解
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
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
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
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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