[英]SQL Server find consecutive failure records
I've look at so many other questions and nothing quite fits my question or gets me the answer I need, maybe I'm just slow today :( 我看了很多其他问题,但没有一个完全适合我的问题,也无法为我提供所需的答案,也许我今天很慢:(
DECLARE @t TABLE (
[InstructionId] INT,
[InstructionDetailId] INT,
[Sequence] INT,
[Status] INT
)
INSERT INTO @t SELECT 222,111,1, 2
INSERT INTO @t SELECT 222,112,2,2
INSERT INTO @t SELECT 222,113,3,4
INSERT INTO @t SELECT 222,114,4,4
INSERT INTO @t SELECT 222,115,5,2
INSERT INTO @t SELECT 222,116,6,4
INSERT INTO @t SELECT 222,117,7,2
INSERT INTO @t SELECT 222,118,8,4
INSERT INTO @t SELECT 222,119,9,4
INSERT INTO @t SELECT 222,120,10,2
INSERT INTO @t SELECT 222,121,11,2
I need to find for which InstructionDetailId's there are consecutive failures (Status = 4) by using the [Sequence] field for checking the order to determine if they are consecutive. 我需要使用[Sequence]字段检查顺序以确定它们是否连续,以查找哪些InstructionDetailId连续失败(状态= 4)。 So for the above InstructionDetailId 113 and 114 would be consecutive failures as their [Sequence] is 3 & 4, same for InstructionDetailId 118 and 119 would be consecutive failures. 因此,对于上面的InstructionDetailId 113和114,它们将是连续失败,因为它们的[Sequence]为3和4,对于InstructionDetailId 118和119,它们将是连续失败。 I've tried so many row number variation and cte's and I can't quite crack it :( This is for SQL Server 2008 R2 by the way. 我已经尝试了很多行号变化和cte,但我还不太明白:(顺便说一下,这是针对SQL Server 2008 R2的。
Expected output: 预期产量:
InstructionId InstructionDetailId Sequence Status
222 113 3 4
222 114 4 4
222 118 8 4
222 119 9 4
Thanx all! 谢谢大家!
Perhaps the simplest method is to use lag()
and lead()
: 也许最简单的方法是使用lag()
和lead()
:
select t.*
from (select t.*,
lag(t.status) over (partition by t.InstructionId order by t.sequence) as prev_status,
lead(t.status) over (partition by t.InstructionId order by t.sequence) as next_status
from @t t
) t
where status = prev_status or status = next_status;
You can use APPLY
: 您可以使用APPLY
:
select t.*
from @t t outer apply
( select top (1) t1.*
from @t t1
where t1.InstructionId = t.InstructionId and
t1.Sequence < t.Sequence
order by t1.Sequence desc
) t1 outer apply
( select top (1) t2.*
from @t t2
where t2.InstructionId = t.InstructionId and
t2.Sequence > t.Sequence
order by t2.Sequence
) t2
where t.status = 4 and (t.status = t1.status or t.status = t2.status);
Could you do something like... 你能做点什么...
select t1.InstructionID,
t1.InstructionDetailID,
t1.Sequence,
t1.Status,
from @t t1
inner join @t t2 on t1.InstructionID = t2.InstructionID
and t1.Sequence = (t2.Sequence - 1)
and t1.Status = t2.Status
and t1.Status = 4
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