表达式采用逆波兰式表示时，利用（）进行求值。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30130' and id < 2438277 and id<>'2438277' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30130' and id > 2438277 and id<>'2438277' order by id asc limit 5