查找重复的条目SQL

Question

我有一个叫做Member（唯一ID是MemberID）的表，它有许多成员重复，只有第一个和最后一个名字不同，但商业名称，地址，城市，州和邮政编码都是一样。记录导入重复。

如何运行脚本以查找BusinessName，Addr1，City，State和ZIP都相同的重复成员。

我想列在一个页面上，所以我可以选择哪些消除。

任何想法如何为此创建脚本？

提前许多感谢，

保罗

Answer 1

select * from Member as m 
where exists(select MemberID 
     from Member as m2 
     where 
      (m.BusinessName = m2.BusinessName or (m.BusinessName is null and m2.BusinessName is null)) and 
      (m.Addr1 = m2.Addr1 or (m.Addr1 is null and m2.Addr1 is null)) and 
      (m.City = m2.City or (m.City is null and m2.City is null)) and 
      (m.State = m2.State or (m.State is null and m2.State is null)) and 
      (m.ZIP = m2.ZIP or (m.ZIP is null and m2.ZIP is null)) and 
      m.memberID <> m2.MemberID) 

通过上述查询，where检查是否存在重复条目。子查询返回的结果仅在存在MemberID确实不是匹配的副本时发生。这意味着如果有一个独特的行，那么将不会有结果，而如果有一行有一个或多个副本，那么它将被返回。

Answer 2

您想使用的解析函数此：

select m.* 
from (select m.*, 
      count(*) over (partition by BusinessName, Address, City, State, ZipCode) as NumDups 
     from members m 
    ) m 
where NumDups > 1 

NumDups告诉你有多少重复的也有。