ceil(3.05/0.5) = 7
3.05/0.5 = 6.1
ceil(3.55/0.5) = 8
3.55/0.5 = 7.1
oracleceil取整
ceil(3.05/0.5) = 7
3.05/0.5 = 6.1
ceil(3.55/0.5) = 8
3.55/0.5 = 7.1
ceil(3.05/0.5) = 7
3.05/0.5 = 6.1
ceil(3.55/0.5) = 8
3.55/0.5 = 7.1
ceil(3.05/0.5) = 7
3.05/0.5 = 6.1
ceil(3.55/0.5) = 8
3.55/0.5 = 7.1