tune between query/join

Hello everyone
I am running a query which looks like following (running in

select a.account_number, a.id, b.*
  from account a, tmp_account b
where b.amount between a.lowest_amount and a.highest_amount

account has 8000000 rows and tmp_account 150000, the execution plan shows
merge sort join as expected, this query takes around 5 hours to run, is
there anyway to improve this?



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