摘要： 每个类别提取最新一条记录按编号来：select max(topicid) as topicid from tb_bbs_topic where boardid in(6,10,34,12,33,13,18,21,51,49) group by boardid如果是按日期来的话：select * from tb_bbs_topic ainner join (select boardid, max(d... 阅读全文