法对效率的促进作用体现在:(  )

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SQL Error: select id,body,options from ***_enewstiku where sourceid='26874' and id < 2233485 and id<>'2233485' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26874' and id > 2233485 and id<>'2233485' order by id asc limit 5