Oracle中round() 函数与trunc()函数的比较
Oracle中round() 函数与trunc()函数的比较,非常实用。
Oracle中round() 函数与trunc()函数的比较,,非常实用。
round(x[,y])
【功能】返回四舍五入后的值
【参数】x,y,数字型表达式,如果y不为整数则截取y整数部分,如果y>0则四舍五入为y位小数,如果y小于0则四舍五入到小数点向左第y位。
【返回】数字
【示例】 select round(5555.6666,2.1),round(5555.6666,-2.6),round(5555.6666) from dual;
返回: 5555.67 , 5600 , 5556
【相近】trunc(x[,y]) 返回截取后的值,用法同round(x[,y]),只是不四舍五入
trunc(x[,y])
【功能】返回x按精度y截取后的值
【参数】x,y,数字型表达式,如果y不为整数则截取y整数部分,如果y>0则截取到y位小数,如果y小于0则截取到小数点向左第y位,小数前其它数据用0表示。
【返回】数字
【示例】 select trunc(5555.66666,2.1),trunc(5555.66666,-2.6),trunc(5555.033333) from dual;
返回:5555.66 5500 5555
【相近】round(x[,y]) 返回截取后的值,用法同trunc(x[,y]),只是要做四舍五入

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