下列行为中，属于不当得利行为的是（）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24566' and id < 2108779 and id<>'2108779' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24566' and id > 2108779 and id<>'2108779' order by id asc limit 5