SQL重复记录查询(转载)
摘要：
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*frompeoplewherepeopleIdin(selectpeopleIdfrompeoplegroupbypeopleIdhavingcount(peopleId)>1)例二：select*fromtesttablewherenumeber in (selectnumberfrompeoplegroup bynumberhaving count(number) > 1 )可以查出testtable表中number相同的记录2、删除表中多余的重复记录，重复记录是根据单个字段（people 阅读全文
posted @ 2013-01-28 17:57 风过 无痕 阅读(200) 评论(0) 推荐(0) 编辑
