Question

表1-工作

JobID
JobCustomerID
JobAddressID

表2-地址

AddressID
AStreetAddress

表3-客户

CustomerID
CustomerName

查询：

SELECT *
FROM [Jobs] 
LEFT JOIN [Addresses] ON [Jobs].JobAddressID = dbo.Addresses.AddressID  
LEFT JOIN [Customers] ON [Jobs].JobCustomerID = [Customers].CustomerID
GROUP BY AStreetAddress
HAVING (COUNT(AStreetAddress) > 1)

我正在尝试找到地址重复的作业。

错误

专栏Jobs.JobID＆＃39;在选择列表中无效，因为它不包含在聚合函数或GROUP BY子句中。

Answer 1

使用group by，您可以在仅选择列的分组或聚合函数中使用：

SELECT AStreetAddress
FROM [Jobs] 
LEFT JOIN [Addresses] ON [Jobs].JobAddressID = dbo.Addresses.AddressID  
LEFT JOIN [Customers] ON [Jobs].JobCustomerID = [Customers].CustomerID
GROUP BY AStreetAddress
HAVING (COUNT(AStreetAddress) > 1)

你需要这样的东西：

SELECT [Jobs].ID
FROM [Jobs] 
LEFT JOIN [Addresses] ON [Jobs].JobAddressID = dbo.Addresses.AddressID  
LEFT JOIN [Customers] ON [Jobs].JobCustomerID = [Customers].CustomerID
GROUP BY [Jobs].ID
HAVING (COUNT(*) > 1)

Answer 2

这应该适合你：

SELECT *
FROM [Jobs] 

  left JOIN [Addresses] ON [Jobs].JobAddressID = dbo.Addresses.AddressID  
  left JOIN [Customers] ON [Jobs].JobCustomerID = [Customers].CustomerID

WHERE [AStreetAddress] IN (SELECT [AStreetAddress] FROM [Addresses] GROUP BY [AStreetAddress] HAVING COUNT(*) > 1)

Answer 3

重复地址？首先，客户表似乎与此问题无关。其次，您不需要left join。如果地址重复，则表之间存在匹配。第三，你有两种方法可以获得重复：地址id可以重复或地址本身。

如果你想要有重复地址的作业，我希望这样的查询：

SELECT j.JobId, a.AStreetAddress
FROM [Jobs] j JOIN
     [Addresses] a
     ON j.JobAddressID = a.AddressID  
GROUP BY j.JobId, a.AStreetAddress
HAVING COUNT(*) > 1;

显示SQL连接的重复项

3 个答案: