SQL重复记录查询的几种方法

1 查找表中多余的重复记录，重复记录是根据单个字段
1 select * from  TB_MAT_BasicData1
2 where MATNR in ( select MATNR from  TB_MAT_BasicData1 group by MATNR having count(MATNR)>1)

2.表需要删除重复的记录（重复记录保留1条），

select distinct * into #Tmp from TB_MAT_BasicData1
drop table TB_MAT_BasicData1
select * into TB_MAT_BasicData1 from #Tmp
drop table #Tmp