统计分组的核心问题是（ ）。[西安交大2006研]

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='30461' and id < 2461148 and id<>'2461148' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30461' and id > 2461148 and id<>'2461148' order by id asc limit 5