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函数:MySQL中取整函数round和floor_MySQL

Jun 01, 2016 pm 01:29 PM
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函数:MySQL中取整函数round和floor

 

示例:

 round(123.456,2)      ------------   123.47ROUND   (   numeric_expression   ,   length   [   ,   function   ]   )   
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参数

numeric_expression

精确数字或近似数字数据类型类别的表达式(bit 数据类型除外)。

length

是 numeric_expression 将要四舍五入的精度。length 必须是 tinyint、smallint 或int。当 length 为正数时,numeric_expression 四舍五入为 length 所指定的小数位数。当 length 为负数时,numeric_expression 则按 length 所指定的在小数点的左边四舍五入。

function

是要执行的操作类型。function 必须是 tinyint、smallint 或 int。如果省略 function 或 function 的值为 0(默认),numeric_expression 将四舍五入。当指定 0 以外的值时,将截断 numeric_expression。

round(123.456,   0)     -------         123.000     SELECT   FLOOR(123.45),   FLOOR(-123.45),   FLOOR($123.45)   ---------             ---------           -----------   123                         -124                     123.0000           SELECT   CEILING(123.45),   CEILING(-123.45),   CEILING(0.0) 
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  以下

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