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)

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

3.查询重复
select count(1),UnitsofmeasureGuid from TB_MAT_UnitsOfMeasure
group by UnitsofmeasureGuid
having count(1)>1