SQL Server數據透視表，空值結果

Question

這是我知道的一個受歡迎的問題。我只是瞭解數據透視表，不知道我哪裏出錯。

create table #test 
(
    id varchar(4), 
    code varchar(2), 
    received_dt varchar(8) 
) 

insert into #test values ('1234','10','20150312') 
insert into #test values ('1234','71','20150312') 
insert into #test values ('1234','C5','20150312') 
insert into #test values ('4321','10','20150312') 
insert into #test values ('4321','71','20150312') 
insert into #test values ('987','10','20150312') 
insert into #test values ('987','71','20150312') 
insert into #test values ('987','C5','20150312') 

select id, [code1], [code2], [code3] 
from #test 
pivot(MAX(code) for code in ([code1], [code2], [code3])) as pvt 

drop table #test 

任何幫助/指導，非常感謝。我知道這應該很容易，但我似乎無法圍繞它圍繞我的大腦。

結果：

ID  Code1 Code2 Code3 
1234 NULL NULL NULL 
4321 NULL NULL NULL 
987  NULL NULL NULL 

旺旺：

ID  Code1 Code2 Code3 
1234 10  71  C5 
4321 10  71  NULL 
987  10  71  C5 

編輯有很多代碼值。

Answer 1

你需要創建一個包含Code1, Code2, Code3值的另一列：

;WITH CTE AS 
(
    SELECT *, 
      RN = 'Code' + 
       CAST(ROW_NUMBER() OVER(PARTITION BY ID ORDER BY code) AS CHAR(1)) 
    FROM #test 
) 
SELECT id, [code1], [code2], [code3] 
FROM CTE 
PIVOT(MAX(code) for RN in ([code1], [code2], [code3])) as pvt; 

UPDATE

如果你有數目不詳的代碼，你需要動態SQL：

DECLARE @sql NVARCHAR(MAX) = N'', @cols NVARCHAR(MAX) = N''; 

WITH CTE AS 
(
    SELECT *, 
      RN = 'Code' + 
       CAST(ROW_NUMBER() OVER(PARTITION BY ID ORDER BY code) AS CHAR(1)) 
    FROM #test 
) 
SELECT @cols += STUFF((SELECT ',' + QUOTENAME(RN) 
         FROM CTE 
         GROUP BY RN 
         FOR XML PATH('')), 1, 1, ''); 


SET @sql = N' 
SELECT * 
FROM ( SELECT *, 
       RN = ''Code'' + 
       CAST(ROW_NUMBER() OVER(PARTITION BY ID ORDER BY code) AS CHAR(1)) 
    FROM #test) AS d 
PIVOT(MAX(code) for RN in (' + @cols + ')) AS p;'; 

EXEC sp_executesql @sql;