1

我有以下两张表；ICD创建使用

CREATE TABLE ICD ([E] VARCHAR(8), [I] VARCHAR(8));
GO
INSERT INTO ICD ([E], [I])
VALUES
    ('1', 'B1'),
    ('1', 'A1'),
    ('1', 'C23q'),
    ('1', '32Dq'),
    ('2', 'FFFq'),
    ('2', 'ERRE'),
    ('2', 'E'),
    ('3', 'WQWW'),
    ('3', 'WQ'),
    ('4', 'AAAA');
GO

whereO给出了将列I插入另一个表的顺序。第二个表是Episode，这是使用创建的

CREATE TABLE Episode ([EpiNum] VARCHAR(4), [SomeField] VARCHAR(4), 
                      [DX1] VARCHAR(10), [DX2] VARCHAR(10), 
                      [DX3] VARCHAR(10), [DX4] VARCHAR(10));
GO
INSERT INTO Episode ([EpiNum], [SomeField], [DX1], [DX2], [DX3], [DX4])
VALUES
    ('1', 'Test', '', '', '', ''),
    ('2', 'Test', '', '', '', ''), 
    ('3', 'Test', '', '', '', '');
GO

所以我的目标是根据是否有要插入的值将列I中的值插入ICD到DXn字段中。忍受我；我有这个工作使用

MERGE INTO [Episode] AS T 
USING (
   SELECT [EpiNum], [1], [2], [3], [4] 
   FROM 
      ( 
          SELECT *, ROW_NUMBER() 
            OVER (PARTITION BY [EpiNum] ORDER BY [I]) AS rn
          FROM [ICD] 
      ) AS p
    PIVOT 
   (
      MAX([I]) 
      FOR rn IN ([1], [2], [3], [4])) AS p2
   ) AS S
ON T.[EpiNum] = S.[EpiNum] 
WHEN MATCHED THEN
   UPDATE SET [DX1] = S.[1], [DX2] = S.[2], [DX3] = S.[3], [DX4] = S.[4];

这会产生一个Episode看起来像的表格

EpiNum  Test    DX1     DX2     DX3     DX4
'1'     'Test'  '32Dq'  'A1'    'B2'    'C23q'  
'2'     'Test'  'E'     'ERRE'  'FFFq'  null
'3'     'Test'  'WQ'    'WQWW'  null    null
'4'     'Test'  'AAAA'  null    null    null

伟大的！等等...不太好，ORDER BYPIVOT/MERGE 中的 破坏了数据的原始顺序。我试图通过添加另一个O包含我想要的顺序的列来解决这个问题，所以ICD定义为

CREATE TABLE ICD ([E] VARCHAR(8), [I] VARCHAR(8), [O] INT);
GO
INSERT INTO ICD ([E], [I], [O])
VALUES
    ('1', 'B1.2', 1),
    ('1', 'A1.2', 2),
    ('1', 'C23q', 3),
    ('1', '32Dq', 4),
    ('2', 'FFFq', 1),
    ('2', 'ERRE', 2),
    ('3', 'WQWW', 1),
    ('4', 'AAAA', 1);
GO

我正在ORDER BY尝试O使用

MERGE INTO [Episode] AS T 
USING (
    SELECT [E], [1], [2], [3], [4] 
    FROM 
        ( 
             SELECT *, ROW_NUMBER() 
               OVER (PARTITION BY [E] ORDER BY [O]) AS rn
             FROM [ICD] 
        ) AS p
    PIVOT 
    (
       MAX([I]) 
       FOR rn IN ([1], [2], [3], [4])) AS p2
    ) AS S
ON T.[E] = S.[E] 
WHEN MATCHED THEN
    UPDATE SET [DX1] = S.[1], [DX2] = S.[2], [DX3] = S.[3], [DX4] = S.[4];

但我收到以下消息

MERGE 语句多次尝试更新或删除同一行。当目标行匹配多个源行时会发生这种情况。MERGE 语句不能多次 UPDATE/DELETE 目标表的同一行。优化 ON 子句以确保目标行最多匹配一个源行，或使用 GROUP BY 子句对源行进行分组。

如何修改上述内容MERGE/PIVOT以正确订购？

谢谢你的时间

4

1 回答 1

1

好吧，您的示例运行不正确，因为您正在混合列[E]以及Epinum在创建表和查询之间。但是假设这些实际上是相同的列，那么您的第二个查询不起作用，因为您实际上并没有对[E]列进行分组。试试这个：

MERGE INTO [Episode] AS T 
USING (
    SELECT [E], [1], [2], [3], [4] 
    FROM 
        ( 
             SELECT [E], [I], ROW_NUMBER() 
               OVER (PARTITION BY [E] ORDER BY [O]) AS rn
             FROM [ICD] 
        ) AS p
    PIVOT 
    (
       MAX([I]) 
       FOR rn IN ([1], [2], [3], [4])) AS p2
    ) AS S
ON T.[Epinum] = S.[E] 
WHEN MATCHED THEN
    UPDATE SET [DX1] = S.[1], [DX2] = S.[2], [DX3] = S.[3], [DX4] = S.[4];

现在，我真的不明白您为什么要使用ROW_NUMBER()而不是简单地使用[O]列（值对我来说似乎相同），但这两种方式都有效。

于 2013-10-03T16:37:36.633 回答