Millions of records? Not true at all!
You can do simply one query, say you want to find out all records that are in table1 but not table2, then you can either:
select blah from table1 t1
where not exists
(select 1 from table2 t2
where t1.blah = t2.blah
)
Or (if munus is supported):
select blah from table1
minus
select blah from table2
It should be easy for you to modify the query a bit to satisfy your needs.
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