SQL Server 查询与连接并将两行合并为单行记录

Question

我有一个这样的示例表

我想以这种方式获得我的查询的最终结果

我不知道如何创建 SQL Server 查询来存档上述结果。你介意指导我如何使它工作吗？

问候，

Answer 1

假设您最多有两行，您可以使用row_number() 来枚举值和条件聚合（或者，如果您愿意，也可以使用数据透视）：

select m.movementid, m.arrflt, m.depflt,
       sum(case when seqnum = 1 then des else 0 end) as des_1,
       sum(case when seqnum = 1 then cargo else 0 end) as cargo_1,
       sum(case when seqnum = 1 then mail else 0 end) as mail_1,
       sum(case when seqnum = 1 then luggage else 0 end) as luggage_1,
       sum(case when seqnum = 2 then des else 0 end) as des_2,
       sum(case when seqnum = 2 then cargo else 0 end) as cargo_2,
       sum(case when seqnum = 2 then mail else 0 end) as mail_2,
       sum(case when seqnum = 2 then luggage else 0 end) as luggage_2
from movement m join
     (select md.*,
             row_number() over (partition by movementid order by movementid) as seqnum
      from movementdetail md
     ) md
     on md.movementid = m.movementid
group by m.movementid, m.arrflt, m.depflt;