SQL合并多行到一个多列

Question

我已经从我查询了我的结果是多行：

例如，表“地址”：

Street | Number | City 
---------------------- 
A1  | A2  | A3 
B1  | B2  | B3 

其实我要的是：

Address1_Street | Address1_Number | Address1_City | Address2_Street | Address2_Number | Address2_City 
------------------------------------------------------------------------------------------------------ 
A1    | A2    | A3   | B1    | B2    | B3 

任何人谁知道我可以做到这一点？

我已经成功地得到了这一点，现在（对不起，使用等栏目，在一个上面就是一个例子，但我猜你会得到点）：

select distinct 
    a.ID, 
    a.Name, 
    ca1.NameLine1 as Address1_NameLine1, 
    ca2.NameLine1 as Address2_NameLine1 
from 
    dbo.Accounts a, 
    dbo.Addresses ca1, 
    dbo.Addresses ca2 
where 
     (a.ID = ca1.AccountID AND a.ID = ca2.AccountID) 
    AND (a.Name = 'TEST') 
    AND (ca1.ID <> ca2.ID) 

但我仍然得到2行... Address1与Address2交换。谁知道如何才能得到一个？谢谢！

Answer 1

尝试：

select ID, 
     max(Name) Name, 
     max(case when rn=1 then NameLine1 end) Address1_NameLine1, 
     max(case when rn=2 then NameLine1 end) Address1_NameLine2 
from 
(select a.ID, 
     a.Name, 
     ca.NameLine1, 
     rank() over (partition by a.ID order by ca.ID) rn 
from dbo.Accounts a 
join dbo.Addresses ca on a.ID = ca.AccountID 
where a.Name = 'TEST') sq 
group by ID 

Answer 2

select address1.* ,address2.* from 
Address address1 inner join on Address address2 
on address1.userid=address2.userid 

您可以根据数据选择内连接或左连接。