Tsql查詢需要查找重複項和連接表以確定要刪除哪些項

Question

我有這個查詢可以工作並返回正確的重複數據。

select [serverName], ActiveYN, count(servername) 
from dbo.FarmStats_Server 
group by [serverName], ActiveYN 
having (count(servername) > 1) 

返回260行。

我需要做的是更復雜一點。

SELECT 
    dbo.FarmStats_Farm.FarmName, 
    dbo.FarmStats_Server.ServerName, 
    dbo.FarmStats_Server.obsDT, dbo.FarmStats_Server.ActiveYN 
FROM 
    dbo.FarmStats_Farm 
INNER JOIN 
    dbo.FarmStats_Server ON dbo.FarmStats_Farm.FarmID = dbo.FarmStats_Server.FarmIDFK 
GROUP BY 
    dbo.FarmStats_Farm.FarmName, dbo.FarmStats_Server.ServerName, dbo.FarmStats_Server.obsDT, dbo.FarmStats_Server.ActiveYN 
HAVING 
    (COUNT(dbo.FarmStats_Server.ServerName) > 1) 

此查詢返回任何結果。我從根本上失去了一些東西。

最終目標是刪除其中一個副本。

感謝您的幫助。

Answer 1

可以在子查詢如下使用：

SELECT 
    dbo.FarmStats_Farm.FarmName, 
    dbo.FarmStats_Server.ServerName, 
    dbo.FarmStats_Server.obsDT, 
    dbo.FarmStats_Server.ActiveYN 
FROM dbo.FarmStats_Farm 
INNER JOIN dbo.FarmStats_Server fs 
    ON dbo.FarmStats_Farm.FarmID = 
    dbo.FarmStats_Server.FarmIDFK 
WHERE EXISTS (SELECT 
    [serverName], 
    ActiveYN 
FROM dbo.FarmStats_Server 
WHERE servername = fs.servername 
AND activeyn = fs.activeyn 
GROUP BY [serverName], 
      ActiveYN 
HAVING (COUNT(servername) > 1))