rounding - MySQL - How can I always round up decimals?

Question

For instance I have the following value:

0.000018

This is 6 decimal places, but I want to round it up the nearest whole 4th decimal place, so that:

0.000018 -> 0.0001

I've played with the round() funcction but if I simply use the round function:

round(0.000018,4) = 0.0000

When dealing with decimals for financial purposes, in this case one needs to round up and charge the customer instead of giving them a freebie! But round() will go round up or down depending on value, I need to consistently round up.

Is there a simple way of doing this?

Answer 1

You can use ceil (ceiling). It only rounds up, so you'll have to multiply with 10000, do the ceil and then divide the result again.

So ceil(0.000145* 10000) = ceil(1.45) = 2 Divide back and you'll have 0.0002

EDIT: wait, wut? that doesn't work. I mean FLOOR obviously but the working is the same :D The manual is on the same page too :)

So floor(0.000145* 10000) = floor(1.45) = 1 Divide back and you'll have 0.0001