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mysql中格式化数字详解

作者:都市烟火  发布时间:2024-01-23 16:44:07 

标签:mysql,数字格式化

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

来源:http://www.cnblogs.com/duhuo/p/6250338.html

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