How to find largest value,any of remaining max values and last remaining max value not used before - oracle

Question

I need to use max_weight,max_height and max_volume using Oracle SQL
as follows:
Length = largest value of Max Height, Max Width or Max Depth
Height = any of the remaining 2 max values
Width = last remaining max value not used before
I have attached basic query to get the max values but I need above filtered one data out of this.
How to write query in order to calculate the same
]1

Answer 1

In the mean time, you might work with this... run it to see what the results are, and then wrap it with and use Case When rmax = 1...
select
MAXNUM
,RANK() over( order by maxnum desc)as rmax
,dim
from (
select
2 as maxnum, 'weight' as dim
union
select
4 as maxnum, 'length' as dim
union
select
8 as maxnum, 'height' as dim
) as nnn

Answer 2

Suppose you have the following data (the columns are labeled col1, col2, col3 in my example; labeling them as "height" or "max_height" is pretty meaningless if the task is to determine WHICH of them is the "height" in each case).
col1 col2 col3
------ ------ ------
10 8 15
11 11 30
13 9 9
15 7 15
And you want to rearrange the numbers in each ROW so that the output looks like this:
length height width
------ ------ ------
15 10 8
30 11 11
13 9 9
15 15 7
Here is an efficient way to do it - you don't have to unpivot the inputs (to put all the numbers in one long column). It works because GREATEST can give you the length, LEAST can give you the width, and to get the middle one, you can add the three numbers and subtract the two extremes. This simplistic approach would NOT work if you had to rank four or more numeric attributes, but it works fine for three.
with
test_data(col1, col2, col3) as(
select 10, 8, 15 from dual union all
select 11, 11, 30 from dual union all
select 13, 9, 9 from dual union all
select 15, 7, 15 from dual
)
-- End of simulated data (not part of the solution).
-- SQL query begins BELOW THIS LINE. Use actual table and column names.
select col1, col2, col3,
greatest(col1, col2, col3) as length,
col1 + col2 + col3 - greatest(col1, col2, col3)
- least(col1, col2, col3) as height,
least(col1, col2, col3) as width
from test_data
;
COL1 COL2 COL3 LENGTH HEIGHT WIDTH
---------- ---------- ---------- ---------- ---------- ----------
10 8 15 15 10 8
11 11 30 30 11 11
13 9 9 13 9 9
15 7 15 15 15 7