sql question: min remapped value

I am trying to remap a field find the row with the minimum value and
then keep the original value and the id number from that row something
like this:

mydata (id, field1)
field1 can = 0,1,2,3,4,5
but I reallt need them ordered like this (1=2, 0=2, 3=4, 4=5, 5=0)
once I find the lowest remapped value I need to know id & field1

I was looking at something like

select id, field1, min(decode(field1,1,1,0,2,3,4,4,5,0)) as flag
from mydata
group by id;

Any help is appreciated and thanks ahead!

Cheers, dn

Douglas Nichols dnichols(at)fhcrc(dot)org
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National Wilms Tumor Study Group 206.667.4283
Seattle, WA