在如图5-1所示的数据流图中，共存在（）个错误。 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30131' and id < 2441960 and id<>'2441960' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30131' and id > 2441960 and id<>'2441960' order by id asc limit 5