Question

我需要组合1列相同的行，其余的类型为nvarchar。

不是Temptable

Id | Key          | Description1 | Description2
 1 | 60287F58-4631| Lorem Ipsum  | dolor sit amet
 2 | 60287F58-4631| consectetur  | adipiscing elit
 3 | 74553234-7543| Test test    | test test

我需要得到这个结果：

Key          | DescriptionCombined
60287F58-4631| Lorem Ipsum, dolor sit amet, consectetur, adipiscing elit
74553234-7543| Test test, test test

我知道group by无效，因为Description1和Description2在公共行之间有所不同。我开始尝试使用for xml path('')，但这会结合每一行。我想我需要首先使用相同的密钥提取组，然后应用for xml path('')，但我无法使其工作。

select ',' + t1.Description1, t1.Description2 from TempTable t1
for xml path('')

Answer 1

我认为您可以将子查询与FOR XML PATH('')

一起使用

SELECT
    [Key],
    STUFF(
        (
            SELECT ', '+Description1+', '+Description2
            FROM TempTable t2
            WHERE t2.[Key]=t1.[Key]
            ORDER BY t2.Id
            FOR XML PATH('')
        ),1,2,'') DescriptionCombined
FROM (SELECT DISTINCT [Key] FROM TempTable) t1

Answer 2

您可以在CTE中使用STUFF功能

CREATE TABLE #TEMP (ID INT,[KEY] NVARCHAR(50),Description1 NVARCHAR(50),Description2 NVARCHAR(50))



INSERT INTO #TEMP
SELECT  1,'60287F58-4631','Lorem Ipsum','dolor sit amet'   UNION ALL
SELECT  2,'60287F58-4631','consectetur','adipiscing elit'  UNION ALL
SELECT 3,'74553234-7543','Test test','test test'

;WITH CTE
AS
    (   SELECT       [Key],
                    STUFF(
                        (
                            SELECT ', '+Description1+', '+Description2
                            FROM #TEMP a
                            WHERE a.[Key]=b.[Key]
                            ORDER BY a.Id
                            FOR XML PATH('')
                        ),1,2,'') DescriptionCombined
FROM (SELECT DISTINCT [Key] FROM #TEMP) b
)
SELECT * FROM CTE

Answer 3

您可以使用OUTER APPLY

DECLARE @TempTable TABLE(Id INT,  [Key]  VARCHAR(20), Description1  VARCHAR(20) , Description2  VARCHAR(20) )
INSERT INTO @TempTable VALUES
( 1 ,'60287F58-4631', 'Lorem Ipsum',  'dolor sit amet'),
( 2 ,'60287F58-4631', 'consectetur',  'adipiscing elit'),
( 3 ,'74553234-7543', 'Test test',    'test test')

select [Key], MAX(STUFF(X.DescriptionCombined,1,1,'')) DescriptionCombined
    FROM @TempTable T1
    OUTER APPLY ( SELECT ', ' + Description1 +', '+ Description2 
                    FROM @TempTable T2 WHERE T1.[Key] = T2.[Key] FOR XML PATH('') ) X ( DescriptionCombined )
GROUP BY [Key]

结果：

Key                  DescriptionCombined
-------------------- ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
60287F58-4631         Lorem Ipsum, dolor sit amet, consectetur, adipiscing elit
74553234-7543         Test test, test test

Answer 4

只是为了好玩 - 采用递归CTE方法：

;WITH cte AS (
    SELECT  TOP 1 WITH TIES id, 
            [Key],
            CAST(CONCAT(Description1,', ',Description2)  as nvarchar(max))as DescriptionCombined,
            1 as lev
    FROM YourTable y
    ORDER BY ROW_NUMBER() OVER (PARTITION BY [Key] ORDER BY id ASC)
    UNION ALL
    SELECT  y.id,   
            c.[Key],
            CAST(CONCAT(c.DescriptionCombined,', ',Description1,', ',Description2)  as nvarchar(max))as DescriptionCombined,
            lev+1
    FROM YourTable y
    INNER JOIN cte c
        ON y.[Key] = c.[key] AND y.[id] > c.[id]
)


SELECT TOP 1 WITH TIES  [Key],
                        DescriptionCombined
FROM cte
ORDER BY ROW_NUMBER() OVER (PARTITION BY [Key] ORDER BY lev DESC)

输出：

Key             DescriptionCombined
60287F58-4631   Lorem Ipsum, dolor sit amet, consectetur, adipiscing elit
74553234-7543   Test test, test test

将多个文本行组合为相同的列

4 个答案: