摘要： 转载自：http://hi.baidu.com/egainwoo/blog/item/517bbc0a79d4191495ca6b90.html 1、查找表中多余的重复记录，重复记录是根据单个字段（peopleId）来判断select * from peoplewhere peopleId in (select peopleId from people group by peopleId havi... 阅读全文