T-SQL選擇每個州最暢銷的產品

我有多個產品銷往全國各地。我將如何看到每個州的最暢銷產品是什麼？T-SQL選擇每個州最暢銷的產品

CREATE TABLE Customers (
CustomerID Int Not 
, Name Varchar(75) 
, UserName Varchar(75) 
, Password Varchar(75) 
, Email Varchar(75) 
, PrimaryPhone Varchar(50) 
, Primary Key (CustomerID) 
) 

CREATE TABLE ShippingAddress (
AddressID Int Primary Key 
, CustomerID Int 
, Street (75) 
, State Varchar (75) 
, Zip Varchar (75) 
,Foreign Key (CustomerID) REFERENCES Customers 
) 

CREATE TABLE PaymentInfo (
CreditCardNumber Int Primary Key 
, CardExpDate Date 
, CVVCode Int 
, CustomerID Int 
, AddressID Int 
, Foreign Key (CustomerID) REFERENCES Customers 
, Foreign Key (AddressID) REFERENCES Addresses 
) 

CREATE TABLE Orders (
OrderID Int Primary Key 
, OrderDate Date 
, CustomerID Int 
, TotalPrice Int 
, Foreign Key (CustomerID) REFERENCES Customers 
) 

CREATE TABLE Shipping (
ShippingID Int Primary Key 
, OrderID Int 
, AddressID Int 
, Foreign Key (OrderID) REFERENCES Orders 
, Foreign Key (AddressID) REFERENCES Addresses 
) 

CREATE TABLE OrderPayment (
OrderID Int 
, CreditCardNumber Int 
, Primary Key (OrderID, CreditCardNumber) 
, Foreign Key (OrderID) REFERENCES Orders 
, Foreign Key (CreditCardNumber) REFERENCES PaymentInfo 
) 

CREATE TABLE Inventory (
ItemModelNumber Int Primary Key 
, Brand Int 
, ItemDescription Text 
, StockQuantity Int 
) 

CREATE TABLE OrderItems (
OrderID Int 
, ItemModelNumber Int 
, Primary Key (OrderID, ItemModelNumber) 
, Foreign Key (OrderID) REFERENCES Orders 
, Foreign Key (ItemModelNumber) REFERENCES Inventory 
) 


CREATE TABLE Sources (
DistributorID Int Primary Key 
, DistributorName Varchar(75) 
) 

CREATE TABLE InventorySource (
ItemModelNumber Int 
, DistributorID Int 
, RequestedDate Date 
, DeliveredDate Date 
, RequestedQuantity Int 
, Primary key (ItemModelNumber, DistributorID) 
, Foreign Key (ItemModelNumber) REFERENCES Inventory 
, Foreign Key (DistributorID) REFERENCES Sources 
) 

GO 


CREATE VIEW BestSellers AS(

所以我知道我想從ShippingAddress中選擇DISTINCT狀態。然後，我想我需要從OrderItems表中計數（ItemModelNumber），OrderID，並將這些列與ShippingAddress表中的Distinct State列進行連接。然後在狀態上只是一個GROUP BY聲明..到目前爲止這是否正確？

來源

2015-03-19 pdangelo4

邏輯是正確的，但在哪裏查詢定義您的邏輯？ – 2015-03-19 07:01:37

所有這些表都與您的查詢有關嗎？如果不是，那麼不要顯示它們，因爲它只會增加你所問問題的噪音。 – sr28 2015-03-19 11:47:36

在我看來，這裏可能有些遺漏。我在哪裏可以看到每件訂單訂購了多少件物品以及價格是多少。此外，我有點朦朧你的意思是「最暢銷」。是創造收入最多的項目，訂單最多的項目還是發貨量最大的項目？ – Ralph 2015-03-20 15:38:36

我覺得下面的查詢提供每個國家最好的項目

注：我使用COUNT（*），因爲我沒有找到訂單

SELECT best.* 
FROM (
     SELECT sales.* 
      , I.ItemDescription 
      , ROW_NUMBER() OVER(PATITION BY sales.State ORDER BY sales.quantity DESC) AS sort 
     FROM (
       SELECT SA.State 
        , OI.ItemModelNumber 
        , COUNT(*) AS quantity 
       FROM OrderItems OI 
        INNER JOIN 
         Shipping S 
         ON OI.OrderID = S.OrderID 
        INNER JOIN 
         ShippingAddress SA 
         ON S.AddressID = SA.AddressID 
       GROUP BY SA.State 
        , OI.ItemModelNumber 
       ) sales 
      INNER JOIN 
       Inventory I 
       ON sales.ItemModelNumber = I.Inventory 
     ) best 
WHERE best.sort = 1

我希望這是一個「數量」字段幫助

Regards

來源

2015-07-21 02:28:55

T-SQL選擇每個州最暢銷的產品

回答

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