设顺序表的长度为n。下列算法中，最坏情 况下比较次数等于n( n - 1 )/2的是（ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29839' and id < 2421755 and id<>'2421755' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29839' and id > 2421755 and id<>'2421755' order by id asc limit 5