數據透視表代碼，需要一些想法

Question

我正在處理透視問題。我想出了一些代碼，但在編寫代碼時一直沒有成功。請有人給我一些指導，說明我在這裏做錯了什麼？

我有表1，這是在下面的代碼創建：

create table T1 (
    [name] varchar(30) 
    ,[size] int 
    ,[DT] date) 

insert into T1 values ('x1', 14, '01/03/2013'); 
insert into T1 values ('x1', 134, '01/04/2013'); 
insert into T1 values ('x1', 199, '01/05/2013'); 
insert into T1 values ('x1', 284, '01/06/2013'); 
insert into T1 values ('x2', 212, '01/03/2013'); 
insert into T1 values ('x2', 369, '01/04/2013'); 
insert into T1 values ('x2', 439, '01/05/2013'); 
insert into T1 values ('x2', 555, '01/06/2013'); 

我需要將表樞轉進入這個格式：

01/03/13 01/04/2013 01/05/2013 01/16/2013 
X1 14   134  199   284 
X2 212   369  439   555 

這是我一直在工作的代碼，但在將其應用到上述輸出中時未成功？任何想法或指針對我？在此先感謝...

declare @DateList as varchar(max) 
declare @dynamic_PQ as varchar(max) 

select @DateList = 
    stuff(  (
select DISTINCT 
     ', '+ Quotename(CONVERT(VARCHAR(10),DT,110)) 
    from 
    (  select dt from t1) t 
    for xml path ('') 
    ),1,1,'') 

    select @DateList 

set @dynamic_PQ = 'select [GuestID], ' + @DateList + 
    ' from 
    (
    Select [name], 
     size, 
     STUFF((SELECT distinct '', '' + convert(a2.size as varch(10)) 
       from t1 a2 
       where src.name = a2.name 
        and src.dt = a2.dt 
        FOR XML PATH(''''), TYPE 
       ).value(''.'', ''NVARCHAR(MAX)'') 
       ,1,1,'''') answer 
    from 
    (
     select name, 
     dt , 
     size 
     from t1 
    ) src 
    ) as S 
    PIVOT 

    (
    MAX([size]) 
    for Question IN (' + @DateList + ') 
    ) as P 

    Exec(@dynamic_PQ) 

PS：如果有一些特別的東西，你必須做的就是人回答/您的帖子作出迴應，請隨時在你的迴應分享。

Answer 1

您有未閉合的引號，額外的不必要的支架，整體的一部分了東西長達動態sql中的XML是不需要的（對於輸出描述），列名錯誤...

declare @DateList as varchar(max) 
declare @dynamic_PQ as varchar(max) 

select @DateList = 
    stuff(  (
select DISTINCT 
     ', '+ Quotename(CONVERT(VARCHAR(10),DT,110)) 
    from 
    (  select dt from t1) t 
    for xml path ('') 
    ),1,1,'') 

    --select @DateList 

set @dynamic_PQ ='SELECT * from 
    (
     select name, 
     dt , 
     size 
     from t1 
    ) as S 
    PIVOT 
    (
    MAX([size]) 
    for DT IN ('+ @DateList +') 
    ) as P' 



    EXEC (@dynamic_PQ) 

SQLFiddle DEMO

Answer 2

您的查詢有多個錯誤。此版本的工作原理如下：

select [name], [01-03-2013], [01-04-2013], [01-05-2013], [01-06-2013] 
from (Select [name], size, 
     STUFF((SELECT distinct ', ' + cast(a2.size as varchar(10)) 
       from t1 a2 
       where src.name = a2.name and src.dt = a2.dt 
       FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)') ,1,1,'' 
      ) as question 
     from (select name, dt , size 
       from t1 
      ) src 
    ) S 
PIVOT (MAX([size]) for Question IN ([01-03-2013], [01-04-2013], [01-05-2013], [01-06-2013]) 
    )as pvt; 

您應該打印出SQL並運行它進行調試。以下是一些問題：

• 您在代碼中使用question但在代碼中定義了answer。
• 表達convert(a2.size as varch(10))是無意義的SQL
• 的pivot語句需要一個別名
• 列GuestId沒有定義

Answer 3

下面是一個簡單的查詢

select name, [01-03-2013], [01-04-2013], [01-05-2013], [01-06-2013] from 
     (select name, size, DT from T1)a 
     PIVOT(sum(size) for DT in ([01-03-2013], [01-04-2013], [01-05-2013], [01-06-2013])) as pvt