SQL數據透視表列行

Question

我試着去該錶轉換：

Date  |Col1 |Col2 |Col3|Col4|Col5|Col6|Col7|Col8 

2/15/2015|Product1|MTD |1 |2 |3 |4 |5 |6 

2/15/2015|Product1|QTD |11 |22 |33 |44 |55 |66 

2/15/2015|Product1|YTD |111 |222 |333 |444 |555 |666 

這樣：

Date  |Col1 |Type|MTD|QTD|YTD 

2/15/2015|Product1|Col3|1 |11 |111 

2/15/2015|Product1|Col4|2 |22 |222 

2/15/2015|Product1|Col5|3 |33 |333 

2/15/2015|Product1|Col6|4 |44 |444 

2/15/2015|Product1|Col7|5 |55 |555 

2/15/2015|Product1|Col8|6 |66 |666 

使用SQL查詢。 任何幫助將不勝感激

Answer 1

可以做很多工會。

select MTD.date,MTD.col1,MTD.type,MTD.val as MTD,QTD.val as QTD,YTD.val as YTD 
from(
    select 'col3' type,date,col1,col3 as val from yourtable where col2 = 'MTD' 
    union all 
    select 'col4' type,date,col1,col4 from yourtable where col2 = 'MTD' 
    union all 
    select 'col5' type,date,col1,col5 from yourtable where col2 = 'MTD' 
    union all 
    select 'col6' type,date,col1,col6 from yourtable where col2 = 'MTD' 
    union all 
    select 'col7' type,date,col1,col7 from yourtable where col2 = 'MTD' 
    union all 
    select 'col8' type,date,col1,col8 from yourtable where col2 = 'MTD' 
) MTD inner join (
    select 'col3' type,date,col1,col3 as val from yourtable where col2 = 'QTD' 
    union all 
    select 'col4' type,date,col1,col4 from yourtable where col2 = 'QTD' 
    union all 
    select 'col5' type,date,col1,col5 from yourtable where col2 = 'QTD' 
    union all 
    select 'col6' type,date,col1,col6 from yourtable where col2 = 'QTD' 
    union all 
    select 'col7' type,date,col1,col7 from yourtable where col2 = 'QTD' 
    union all 
    select 'col8' type,date,col1,col8 from yourtable where col2 = 'QTD' 
) QTD on MTD.date = QTD.date and MTD.col1 = QTD.col1 and MTD.type = QTD.type 
inner join (
    select 'col3' type,date,col1,col3 as val from yourtable where col2 = 'YTD' 
    union all 
    select 'col4' type,date,col1,col4 from yourtable where col2 = 'YTD' 
    union all 
    select 'col5' type,date,col1,col5 from yourtable where col2 = 'YTD' 
    union all 
    select 'col6' type,date,col1,col6 from yourtable where col2 = 'YTD' 
    union all 
    select 'col7' type,date,col1,col7 from yourtable where col2 = 'YTD' 
    union all 
    select 'col8' type,date,col1,col8 from yourtable where col2 = 'YTD' 
) YTD on MTD.date = YTD.date and MTD.col1 = YTD.col1 and MTD.type = YTD.type