SQL Server查找连续的失败记录

Question

我看了很多其他的问题，没有什么比我的问题更合适或得到我需要的答案，也许我今天只是很慢:(

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

我需要通过使用[Sequence]字段检查订单以确定它们是否连续来找到哪个InstructionDetailId存在连续失败（Status = 4）。因此对于上述InstructionDetailId 113和114将是连续失败，因为它们的[Sequence]是3和4，对于InstructionDetailId 118和119将是连续失败。我已经尝试了这么多的行数变化和cte's，我不能完全解决它:(这是适用于SQL Server 2008 R2的方式。

预期产量：

InstructionId   InstructionDetailId Sequence    Status
222                            113       3           4
222                            114       4           4
222                            118       8           4
222                            119       9           4

谢谢大家！

Answer 1

你可以使用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);

Answer 2

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;

Answer 3

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