Question

在通用术语中，我有一系列事件，我想从中选择使用MS SQL Server 2008 R2的唯一不可重复序列。

具体地说，在这种情况下，每个测试都有一系列记录，每个记录都有特定的刺激序列。我想从一个测试的记录中选择独特的刺激序列，将它们插入另一个表并将序列组id分配给原始表。

DECLARE @Sequence TABLE
([ID]  INT 
,[TestID]  INT
,[StimulusID] INT
,[RecordingID]  INT
,[PositionInRecording] INT
,[SequenceGroupID] INT
)

INSERT @Sequence
VALUES
(1,  1, 101, 1000, 1, NULL),
(2,  1, 102, 1000, 2, NULL),
(3,  1, 103, 1000, 3, NULL),
(4,  1, 103, 1001, 1, NULL),
(5,  1, 103, 1001, 2, NULL),
(6,  1, 101, 1001, 3, NULL),
(7,  1, 102, 1002, 1, NULL),
(8,  1, 103, 1002, 2, NULL),
(9,  1, 101, 1002, 3, NULL),
(10, 1, 102, 1003, 1, NULL),
(11, 1, 103, 1003, 2, NULL),
(12, 1, 101, 1003, 3, NULL),
(13, 2, 106, 1004, 1, NULL),
(14, 2, 107, 1004, 2, NULL),
(15, 2, 107, 1005, 1, NULL),
(16, 2, 106, 1005, 2, NULL)

在正确识别唯一序列后，结果应如下所示

DECLARE @SequenceGroup TABLE
([ID]  INT 
,[TestID] INT
,[SequenceGroupName]  NVARCHAR(50)
)

INSERT @SequenceGroup VALUES
(1, 1, '101-102-103'),
(2, 1, '103-103-101'),
(3, 1, '102-103-101'),
(4, 2, '106-107'),
(5, 2, '107-106')


DECLARE @OutcomeSequence TABLE
([ID]  INT 
,[TestID]  INT
,[StimulusID] INT
,[RecordingID]  INT
,[PositionInRecording] INT
,[SequenceGroupID] INT
)

INSERT @OutcomeSequence
VALUES
(1,  1, 101, 1000, 1, 1),
(2,  1, 102, 1000, 2, 1),
(3,  1, 103, 1000, 3, 1),
(4,  1, 103, 1001, 1, 2),
(5,  1, 103, 1001, 2, 2),
(6,  1, 101, 1001, 3, 2),
(7,  1, 102, 1002, 1, 3),
(8,  1, 103, 1002, 2, 3),
(9,  1, 101, 1002, 3, 3),
(10, 1, 102, 1003, 1, 3),
(11, 1, 103, 1003, 2, 3),
(12, 1, 101, 1003, 3, 3),
(13, 2, 106, 1004, 1, 4),
(14, 2, 107, 1004, 2, 4),
(15, 2, 107, 1005, 1, 5),
(16, 2, 106, 1005, 2, 5)

Answer 1

在MySQL和支持某种版本的GROUP_CONCAT功能的其他数据库中，这很容易做到。在SQL Server中，这显然更难处理。这是一个讨论一种技术的stackoverflow question。这里是another，其中包含一些有关SQL Server 2008特定解决方案的信息，这些信息也可能帮助您入门。

Answer 2

这样做。必须向@SequenceGroup添加一列。

DECLARE @Sequence TABLE
([ID]  INT 
,[TestID]  INT
,[StimulusID] INT
,[RecordingID]  INT
,[PositionInRecording] INT
,[SequenceGroupID] INT
)

INSERT @Sequence
VALUES
(1,  1, 101, 1000, 1, NULL),
(2,  1, 102, 1000, 2, NULL),
(3,  1, 103, 1000, 3, NULL),
(4,  1, 103, 1001, 1, NULL),
(5,  1, 103, 1001, 2, NULL),
(6,  1, 101, 1001, 3, NULL),
(7,  1, 102, 1002, 1, NULL),
(8,  1, 103, 1002, 2, NULL),
(9,  1, 101, 1002, 3, NULL),
(10, 1, 102, 1003, 1, NULL),
(11, 1, 103, 1003, 2, NULL),
(12, 1, 101, 1003, 3, NULL),
(13, 2, 106, 1004, 1, NULL),
(14, 2, 107, 1004, 2, NULL),
(15, 2, 107, 1005, 1, NULL),
(16, 2, 106, 1005, 2, NULL)

DECLARE @SequenceGroup TABLE
([ID]  INT IDENTITY(1, 1)
,[TestID] INT
,[SequenceGroupName]  NVARCHAR(50)
,[RecordingID] INT
)

insert into @SequenceGroup
select  TestID, (stuff((select '-' + cast([StimulusID] as nvarchar(100))
from @Sequence t1
where t2.RecordingID = t1.RecordingID
for xml path('')), 1, 1, '')), RecordingID
from @Sequence t2
group by RecordingID, TestID
order by RecordingID

select * from @SequenceGroup

update @Sequence
set SequenceGroupID = sg.ID
from @Sequence s
join @SequenceGroup sg on s.RecordingID=sg.RecordingID and s.TestID=sg.testid

select * from @Sequence

如何在SQL中选择唯一的子序列？

2 个答案: