Imagine the following data:

A B C D
1003 0.89 R1 23
1003 0.59 R2 24
2444 0.32 R1 23
2444 0.84 R2 24
1003 1.14 R3 13
1003 0.79 R1 23
1003 0.12 R1 16


WITHOUT using ANY LOOPS (or ADO/SQL), I would like to
retrieve the lowest value for B , where A = 1003 and C =
R1 and D = 23 (affectively criteria from the first row).

In this case the answer should be B=0.79.


Does anybody know a way that this can be done!? (it would
have to work assuming that there were 4000+ rows in the
table)