Question

我想从表A中选择与以下查询不匹配的数据。换句话说，除了以下记录之外，我想要表A中的所有内容。我假设它是一个左连接，但我收到的预期比预期更多。

SELECT distinct  
    a.Address_Direction,
    a.Address_Extension,
    a.Address_Number,
    a.Address_Root,
    a. PHY_ADDR1,
    b.PHY_ADDR1
FROM [RD_GeoCode].[dbo].[PA_Stg_Test2] AS a
inner JOIN [RD_GeoCode].[dbo].[rg_ApplicationData_AllForms_20160401_address] AS b ON 
 B.address_direction = a.address_direction  
and B.address_root  =  a.address_root
and B.address_number = a.address_number
and B.Address_Extension = a.Address_Extension
and b.PHY_ZIPCD = a.PHY_ZIPCD

Answer 1

使用左连接并添加Where B.AnyField Is Null如注释，B.AnyField必须是没有Null的列，如主键，否则您将得到误报。

另外请确保您的加入条件不允许重复，因为这会导致您的号码丢失。

Answer 2

与左连接一起，您必须检查B中的相应条目是否为空。请尝试以下查询：

SELECT distinct   a.Address_Direction, a.Address_Extension, a.Address_Number, a.Address_Root, a. PHY_ADDR1, b.PHY_ADDR1
FROM [RD_GeoCode].[dbo].[PA_Stg_Test2] AS a
LEFT JOIN [RD_GeoCode].[dbo].[rg_ApplicationData_AllForms_20160401_address] AS b ON 
 B.address_direction = a.address_direction  
AND B.address_root  =  a.address_root
AND B.address_number = a.address_number
AND B.Address_Extension = a.Address_Extension
AND b.PHY_ZIPCD = a.PHY_ZIPCD
WHERE B.address_number IS NULL

SQL左外连接与内连接不等于

2 个答案: