1 use StudentManageDB 2 go 3 insert into ScoreList (StudentId,CSharp,SQLServerDB)values(100006,52,80) 4 insert into ScoreList (StudentId,CSharp,SQLServerDB)values(100007,91,66) 5 insert into ScoreList (StudentId,CSharp,SQLServerDB)values(100009,78,35) 6 7 select * from ScoreList order by StudentId 8 9 --在知道那个字段重复的情况 10 select StudentId from ScoreList group by StudentId having COUNT(*)>1 11 12 --查询所有重复的记录 13 select * from ScoreList 14 where StudentId in(select StudentId from ScoreList group by StudentId having COUNT(*)>1) 15 order by StudentId 16 17 --其他方法 18 select * from ScoreList 19 where (select COUNT(*) from ScoreList s where s.StudentId=ScoreList.StudentId)>1 20 order by StudentId 21 22 --过滤掉重复数据 23 select distinct StudentId,CSharp from ScoreList 24 25 select distinct StudentId,CSharp,SQLServerDB from ScoreList