檢索查詢列排

Question

我有下列的表：

 
BillNo -- Integer 
BillDate -- DateTime 
Qty  -- decimal 
ItemName -- varchar 

我想找回這種格式的結果：

 
**ITEMNAME...JAN-2011.....FEB-2011....MAR-2011** 
ITEM1 ......... 20 ..............19................18 
ITEM2 ......... 23 ..............10................9 

我嘗試這個查詢這正顯示出正確的結果，但我想要將第三列轉換爲具有不同值的行：

SELECT ITEMNAME, SUM(QTY), DATE_FORMAT(BILLDATE,'%M-%Y') FROM BILLITEMS 
GROUP BY BILLDATE 
ORDER BY YEAR(BILLDATE) DESC, MONTH(BILLDATE), ITEMNAME; 

Answer 1

嘗試使用下面的查詢，但它會l在特定年份工作

SELECT ITEMNAME, year_bill, SUM(jan), SUM(feb), .... from (
    select case when MONTH(BILLDATE) = 1 then QTY else 0 end as jan, 
    case when MONTH(BILLDATE) = 2 then QTY else 0 end as feb, 
    case when MONTH(BILLDATE) = 3 then QTY else 0 end as mar, 
    ITEMNAME, 
    YEAR(BILLDATE) as year_bill 
from BILLITEMS) as temp 
GROUP BY ITEMNAME, year_bill