>If you have two copies of a database and you want to compare the records,
>and perhaps combine numerical fields for each record, is there a faster way
>to compare them than reading records one by one in the first database and
>then comparing them to the entire second to find a match?

Presort both databases on an indentical sort key if there is one, 
then you should be able to read through each file only once. You can 
find details on appropriate algorithms in a book like Knuth's Sorting 
and Searching.

Regards,
Steve Mann
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