用于在1中合并2行的SQL Server查询

有一个SQL Server表（请参见下面的屏幕截图），我无法更改：

产品具有标识符和工艺参数。有两个进程，A和B。每个进程将数据存储在自己的行中

我想得到一个没有无用空值的表结果。一行一个产品，没有更多。所需的单元格将高亮显示。有关所需输出，请参见第二个屏幕截图：

自动连接？（编辑）

所以

我已经对此进行了快速测试，我认为它看起来是正确的。

自动加入？（编辑）

select a.id,
       isnull(b.state,   a.state)   as state,
       isnull(b.process, a.process) as process,
       isnull(b.length,  a.length)  as length,
       isnull(b.force,   a.force)   as force,
       isnull(b.angle,   a.angle)   as angle
 from      table as a 
 left join table as b 
   on a.id = b.id   
  and b.process = 'B'
where a.process = 'A' 


DECLARE @T AS TABLE (id int, state varchar(10), process varchar(10), length int, angle int  
                     primary key (id, process));
insert into @t (id, state, process, length, angle)  values
      (111, 'OK',  'A', 77, null)
     ,(111, 'OK',  'B', null, 30)
     ,(159, 'NOK', 'A', 89, null)
     ,(147, 'OK',  'A', 78, null)
     ,(147, 'NOK', 'B', null, 36);

select ta.id, --ta.*, tb.*
       isnull(tb.state,   ta.state)   as state,
       isnull(tb.process, ta.process) as process,
       isnull(tb.length,  ta.length)  as length, 
       isnull(tb.angle,   ta.angle)   as angle
 from @t ta 
 left join @t tb 
   on ta.id = tb.id   
  and tb.process = 'B' 
where ta.process = 'A' 
order by ta.id 

所以

---

我已经对此进行了快速测试，我认为它看起来是正确的。

因此，电视上的人们更喜欢基于文本的表格，而不是图像。：）提供您尝试过的SQL是礼貌的。没有文本数据，人们不会进行测试。因此，人们更喜欢包含图像的基于文本的表。：）提供您尝试过的SQL是有礼貌的。如果没有文本数据，人们将不会进行测试。where将中断左侧连接是的，我假设每个状态都有A和B进程，这可能是一个错误。我会更正…示例数据并不都有A和B。如果它们都有，那么您就不需要左连接。请参阅我的答案。你们只需要把它移出where，where会打断左边的连接是的，我假设每个州都有A和B进程，这可能是个错误。我会更正…示例数据并不都有A和B。如果它们都有，那么您就不需要左连接。请参阅我的答案。你们只需要把它搬走。

select a.id,
       isnull(b.state,   a.state)   as state,
       isnull(b.process, a.process) as process,
       isnull(b.length,  a.length)  as length,
       isnull(b.force,   a.force)   as force,
       isnull(b.angle,   a.angle)   as angle
 from      table as a 
 left join table as b 
   on a.id = b.id   
  and b.process = 'B'
where a.process = 'A' 


DECLARE @T AS TABLE (id int, state varchar(10), process varchar(10), length int, angle int  
                     primary key (id, process));
insert into @t (id, state, process, length, angle)  values
      (111, 'OK',  'A', 77, null)
     ,(111, 'OK',  'B', null, 30)
     ,(159, 'NOK', 'A', 89, null)
     ,(147, 'OK',  'A', 78, null)
     ,(147, 'NOK', 'B', null, 36);

select ta.id, --ta.*, tb.*
       isnull(tb.state,   ta.state)   as state,
       isnull(tb.process, ta.process) as process,
       isnull(tb.length,  ta.length)  as length, 
       isnull(tb.angle,   ta.angle)   as angle
 from @t ta 
 left join @t tb 
   on ta.id = tb.id   
  and tb.process = 'B' 
where ta.process = 'A' 
order by ta.id