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When I remove 41 and 42 lines, Elapsed time is “00:00:03.13”. The “com_site” table aliased as [c] has no index or PK.
Result records count is 5503(20 records before removing.)
Could anyone explain me why this happens?
Thanks…
Even though the alias [c] has no index, the conditions
can be processed first if [c] is small enough compared to the other tables. Processing this first would be preferable to processing the correlated 2-level sub-query involving the tuple (bank_cd, acct_no).