两补码相加，采用1位符号位，则当 时，表示结果溢出。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29993' and id < 2430681 and id<>'2430681' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29993' and id > 2430681 and id<>'2430681' order by id asc limit 5