设机器数字长8位（含2位符号位），若机器数DAH为补码，则算术左移一位得 ’簿术右移一位得 o

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29993' and id < 2430687 and id<>'2430687' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29993' and id > 2430687 and id<>'2430687' order by id asc limit 5