I have a worksheet with the following layout:
A B C D
Rating Year Rate Override Rate
Row1 1 2009 4% 2.5%
Row2 1 2010 3%
Row3 3 2009 6%
Row4 1 2010 4%

I'm trying to set up formuals to populate the following:
Titles---------- Forumlas----
Rating Year Min Max
1 2009 2.5% 6.0%
1 2010 3.0% 3.0%

I can't figure out how to select only one column's value for calculating the
Min/Max. D should always replace C, if D is populated. Otherwise only C
should be considered. File is much bigger than this, but an example formula
I was trying to work with (which is not properly calculating the MIN) is:

={MIN(MIN((IF((a1:a4="1")*(b1:b4=2009)*(d1:d4=0),c 1:c4)),MIN((IF((a1:a4="1")*(b1:b4=2009)*(d1:d4<0) ,d1:d4)))))}

Can anyone help?