查询根据地址类型合并数据

Question

我有一张表A如下：

ID Name Age 
1  A     18 
2  B     19

此表与地址表具有一对多的映射。

ID ParentID AddressType ALine1 ALine2 State City Country
10        1 Mail        AAA    AAA    AAB   CCC  CDCD
11        1 Home        BBB    BBA    BAB   CAC  CFCF
12        2 Mail        CAV    VAC    CSC   DFS  DDDC   

我需要获得所需的输出：

Name Age Address1Type ALine1 ALine2 State1 City1 Country1 Address2Type A2Line1 A2Line2  State2 City2 Country2 
---- --- ------------ ------ ------ ------ ----- -------- ------------ ------- -------- ------ ----- --------
A     18 Mail         AAA    AAA    AAB    CCC   CDCD     Home         BBB     BBA      BAB    CAC   CFCF
B     19 Mail         CAV    VAC    CSC    DFS   DDDC     null         null    null     null   null  null

我可以将它们组合在一起，但可以获得同名的多个记录。如何获得我需要的输出？

Answer 1

试试这个：

SELECT          parent.Name,
                parent.Age,
                mailInfo.*,
                homeInfo.*
FROM            parent
LEFT OUTER JOIN addresses AS mailInfo
             ON parent.ID = mailInfo.ParentID
            AND mailInfo.AddressType = 'Mail'
LEFT OUTER JOIN addresses AS homeInfo
             ON parent.ID = homeInfo.ParentID
            AND mailInfo.AddressType = 'Home';