移調/動態PIVOT

Question

爲以下：

信用與6.空白點限定可以爲空。我想創建名爲Credit1，Credit2，..，Credit6的新列。我可以在這種情況下使用PIVOT嗎？或者任何其他簡單的方法來轉置表？

Answer 1

你可以使用動態SQL版本：

CREATE TABLE #SampleData 
(
    Name varchar(50), 
    Credits int 
) 

INSERT INTO #SampleData 
VALUES ('John', 10),('John', 20), 
('Bath', 90), ('Bath', 60), ('Bath', 70),('Bath', 80),('Bath', 50), 
('Richard', 75) 

DECLARE @ColPivot nvarchar(max) 
;WITH temp AS 
(
    SELECT * , 'Credit' + CAST(row_number() OVER(PARTITION BY sd.Name ORDER BY (SELECT 1)) AS varchar(5)) AS CreditGroup 
    FROM #SampleData sd 
) 
SELECT @ColPivot = STUFF(
        (SELECT DISTINCT ',' + t.CreditGroup FROM temp t FOR XML PATH ('')) 
        ,1,1,'') 

DECLARE @query nvarchar(max) = 
     N';WITH temp AS 
     (
      SELECT * , ''Credit'' + CAST(row_number() OVER(PARTITION BY sd.Name ORDER BY (SELECT 1)) AS varchar(5)) AS CreditGroup 
      FROM #SampleData sd 
     ) 
     Select [Name], ' + @ColPivot + 
     ' FROM 
     (
      SELECT [Name], Credits, CreditGroup FROM temp 
     ) src 
     PIVOT 
     (
      MAX(Credits) FOR CreditGroup IN ('+ @ColPivot+ ') 
     )pvt 
     ' 
PRINT @query 

EXEC (@query) 

DROP TABLE #SampleData 

演示鏈接：Rextester