SQL四舍五入、向下取整、向上取整函数介绍
<p><strong>round() </strong>遵循四舍五入把原值转化为指定小数位数，如：round(1.45,0) = 1;round(1.55,0)=2<br><strong>floor()</strong>向下取整 如：floor(1.45)= 1,floor(1.55) = 1 ,floor(-1.45)= -2 ,floor(-1.55) = -2<br><strong>ceiling()</strong>向上取整 如：ceiling(1.45) = 2,ceiling(1.55)=2,ceiling(-1.45) = -1,ceiling(-1.55)=-1</p>
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