面试题中经常遇到的SQL题：删除重复数据，保留其中一条

    如题，解决思路如下:

    1、首先我们需要找出拥有重复数据的记录

1 ---以name字段分组
2 select Name,COUNT(Name) as [count] from Permission group by Name-- having COUNT(Name)>1
3 
4 ---以name字段分组，筛选出有重复出现的字段 having 用于条件筛选 作用相当于where 区别where用于group by 之前，having用于之后
5 select Name,COUNT(Name) as [count] from Permission group by Name having COUNT(Name)>1

查找拥有重复记录的数据