It is a nice thought, but I can see a problem with false negatives too. Suppose the lat in one set is 5000000 and in the other it's 4999998 - those are not going to be found using pattern-matching. You would have to both add and subtract the maximum error and then compare both of those outer limits to the second set. It's do-able in Perl but the RDBMS seems like the better way to me.

In reply to Re^2: CSV Cross Referencing by hippo
in thread CSV Cross Referencing by Jalcock501

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