用max{a1，a2，…，an}表示数集{a1，a2，…，an}中最大的数，则当a>0，b>0，且a≠b时，等于

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='15531' and id < 2638694 and id<>'2638694' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='15531' and id > 2638694 and id<>'2638694' order by id asc limit 5