SQL服務器，視圖

Question

好球員，我試圖創建SQL Server中的視圖最流行的支付方式

CREATE VIEW payType 

AS 

SELECT SaleID, PayID 
FROM tblSales 
GROUP BY 
tblSales.SaleID, tblSales.PayID 

Answer 1

我假設你尋找已使用的每個SaleID的數量付款方式，您的選擇語句將會是這樣的;

SELECT a.PayID 
    ,COUNT(a.SaleID) Sales 
    ,(COUNT(a.SaleID)/b.Tot)*100 = PercentOfTotal 
FROM tblSales a 
JOIN (
    SELECT SaleID 
     ,COUNT(PayID) Tot 
    FROM tbl.Sales 
    GROUP BY SaleID 
    ) b ON a.SaleID = b.SaleID 
GROUP BY a.PayID 
ORDER BY COUNT(a.SaleID) DESC