用sql删除数据库重复的数据的方法

SQL如何删除重复的数据行- -

delete from table where id in (
select max(id) from table group by name having count(*)>1
)--删除重复记录中ID最大的一条(如果有2条以上的重复记录则需多次执行)

如果table数据完全一样，可以先将数据导入到一个临时表内
或

delete from table where id not in (
select min(id) from table group by name
)--只保留重复记录的第一条(id最小的一条)

使用临时表：
insert into temptable select min(id),name from aoptest group by name having count(*)>1

delete from aoptest
insert into aoptest select * from temptable
drop table temptable


删除表中多余的重复记录，重复记录是根据单个字段（peopleName  ）来判断，只留有peopleId 最小的记录

delete from people
where peopleName  in (select  peopleName  from people  group  by  peopleName   having  count(peopleName) > 1)
and peopleId not in (select min(peopleId) from  people  group by peopleName  having count(peopleName )>1)