Must admit, this platform is tricky. Use to web programming but stuck on something I thought would be very easy. I have three fields in one table with length x width x height each separate fields. I need to get the median or middle value. I am lost on how to do this. So if Length = 5, Width = 20, height = 12. I would need to create a calculation showing height is the middle / median value of the three. Any help, thanks for your time and effort.

You have only 3, then

Length + Width + height - Min ( Length ; Width ; height ) - Max ( Length ; Width ; height )

But this show value 12, not field name height