I needed something similar, I got a good start for reading-writing an excel file at:
http://delphi.about.com/od/database/l/aa090903a.htm
I hope it will help you.
A solution in CR:
- create a group gr1 = group ID + SSN
- create a secong group gr2 = address+ city+...
- calculate a running total field on gr2 as tot12: count your gr2..evaluate on each record, reset on change of group;
- print ONLY when tot12 = 1, ( you have only one record with gr2) OR...
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