最近因為工作的需求，需要對mysql/251418.html">mysql中數字進行格式化，但發現網上的資料較少，索性自己總結一下，方便自己也幫助有需要的朋友們，下面話不多說，來一起看看詳細的介紹：

一、format函數：

格式化浮點數 format(number, length);

介紹：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.

示例代碼

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 給定位數，不足補充自定義字符

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.      

示例代碼  

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.

示例代碼

mysql> SELECT LPAD('hi',4,'??'); -> '??hi' mysql> SELECT LPAD('hi',1,'??'); -> 'h' mysql>SELECT LPAD(12, 5 , 0)  ->'00012'

參考：http://www.cnblogs.com/fenglie/articles/4409208.html

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