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 th

Answer 1

Use ROUND(X,D), which rounds the value X to D decimal places.

Answer 2

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

Answer 3

There's another method, which is to add half a multiple of 10. For example: round(x+0.005, 2) where x is 0.923 = 0.93 which reduces the maximum floating point division error.