Just an idea, don't know whether it's useful...
If you can get both files sorted (either by adding order to your sql
query that generates the file, or the commandline 'sort') the problem
becomes much more easy.
You'd just have to traverse each file, something like this:
read word_1 from file_1
read word_2 from file_2
while not at the end of the file
if word_1 < word_2
print: word_1 is not in file_2 !
read next word_1 from file_1
elseif word_2 < word_1
print: word_2 is not in file_1 !
read next word_2 from file_2
else
read next word_1 from file_1
read next word_2 from file_2
end while
Well, the stopping criterium is not quite correct yet, but you'll get my
point.
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