下列三种类型的指令， 执行时间最长。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29994' and id < 2430761 and id<>'2430761' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29994' and id > 2430761 and id<>'2430761' order by id asc limit 5