函是法定的文种之一，理解函的定义的关键是要准确理解（ ）的意义。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31818' and id < 2543124 and id<>'2543124' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31818' and id > 2543124 and id<>'2543124' order by id asc limit 5