查找重複的條目SQL

Question

我有一個叫做Member（唯一ID是MemberID）的表，它有許多成員重複，只有第一個和最後一個名字不同，但商業名稱，地址，城市，州和郵政編碼都是一樣。記錄導入重複。

如何運行腳本以查找BusinessName，Addr1，City，State和ZIP都相同的重複成員。

我想列在一個頁面上，所以我可以選擇哪些消除。

任何想法如何爲此創建腳本？

提前許多感謝，

保羅

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) 

通過上述查詢，where檢查是否存在重複條目。子查詢返回的結果僅在存在MemberID確實不是匹配的副本時發生。這意味着如果有一個獨特的行，那麼將不會有結果，而如果有一行有一個或多個副本，那麼它將被返回。

Answer 2

您想使用的解析函數此：

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

NumDups告訴你有多少重複的也有。