MySQL中删除表中重复数据，只保留一条

以为通过命令直接删除就可以了，总是报错：



delete from test

where name in(select name from test as t having count(name)>1)

发现在这只能建立临时表格,方法1设计可行：

1. 首先先创建一个临时表,然后将author表中无重复的数据拎出来，放进临时表中。
create temporary table 表名
select distinct id,name,password 
from author

然后将author表中的记录全部删除。
delete from author

最后将临时表中的记录插入author表中
insert into author (id,name,password)
select id,name,password 
from 临时表

2.方法2直接使用语句：

delete from test

where name in(select t.name from (select name from test) as t having count(t.name)>1)

and name not in(select min(id) from(select id,name from test group by name)as tt having count(tt.name)>1)

发现总是删错数据，还未得到验证这种查询是否可行