[英]SQL Server query for merging 2 rows in 1
There is a SQL Server table (see the screenshot below) that I cannot change: 有一个我无法更改的SQL Server表(请参见下面的屏幕快照):
Products have identifiers and process parameters. 产品具有标识符和过程参数。 There are 2 processes, A and B. Every process stores data in an own row.
有两个进程,A和B。每个进程将数据存储在自己的行中。
I would like to get a table result without useless NULL values. 我想要一个没有无用NULL值的表结果。 One product on one row, no more.
一种产品排在一行,没有更多。 Desired cells are highlighted.
所需的单元格突出显示。 See the 2nd screenshot for the desired output:
请参阅第二个屏幕截图以获取所需的输出:
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
Self join? 自我加入? (edited)
(编辑)
so, 所以,
select
a.id,
a.process,
isnull(a.length, b.length) as length,
isnull(a.force, b.force) as force,
isnull(a.angle, b.angle) as angle
from
(select * from tmpdel where process = 'A') as a left join
(select * from tmpdel where process = 'B') as b on
a.id = b.id
I've given this a quick test and I think it looks right. 我已经对此进行了快速测试,我认为它看起来不错。
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