若“ ”是“ ”的充分不必要条件，则实数 a的取值范围是

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='15530' and id < 2638564 and id<>'2638564' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='15530' and id > 2638564 and id<>'2638564' order by id asc limit 5