题目内容
磁盘转速提高一倍，则
2021-12-22
A.平均查找时间缩小一半
B.其存取速度也提尚一倍
C.不影响查找时间
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SQL Error: select id,body,options from ***_enewstiku where sourceid='29992' and id < 2430561 and id<>'2430561' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29992' and id > 2430561 and id<>'2430561' order by id asc limit 5