SQL SERVER常用取重复记录的SQL语句

获取某字段或几个字段有重复的数据，可限定重复几条

select field1,field2 from table group by field1,field2 having count(field1)>1

获取某字段不重复的最新记录

select top * from table a where id in(select max(id) from table b group by field) order by id desc

获取某字段的重复数

select count(field) from table group by field having count(field)>1

获取不重复的记录

select field1,field2 from table group by field1,field2

删除重复记录

delete from from table a where id not in(select max(id) from table b group by field)