我有以下的數據庫架構(重圖像),時間總結
而且我想編寫一個查詢該查詢返回的結果是這樣的...... (列標題) :PRODUCT_GROUP - PRODUCT_NAME - Week1 - Week2 - 譯員更加的 - Week4 - QTY_Order
Week1是當前的日期和前7天之間的特定產品的所有銷售。 Week2都是特定商品銷售從2個星期前的(這樣的currentdate -7days及的currentdate之間 - 14日)
譯員更加從3個星期前...等的特定產品的所有銷售;
QTY_Order是第一週,第二週,第三週的特定產品銷售的平均值&第4周。
以下SQL將生成:Product_Group - Product_Name - Week1 - QTY_Order(但quantity_order不正確)。
SELECT Product.ProductGroupId, Product.Name, SUM(SaleLine.Quantity) AS Week1, SUM(SaleLine.Quantity) AS OrderQty
FROM Sale
JOIN SaleLine ON Sale.ID = SaleLine.SaleId
JOIN Product ON SaleLine.ProductId = Product.Id
WHERE Sale.SaleDateTime > (CURDATE() - INTERVAL 7 DAY)
GROUP BY Product.ProductGroupId, Product.Name;
我也嘗試了以下SQL來獲得:PRODUCT_NAME - Week1 - Week2 - QTY_Order(再次,qty_order是不正確的),但week2返回所有空的。
SELECT Product.ProductGroupId, Product.Name, SUM(SaleLine.Quantity) AS Week1, (SELECT SUM(SaleLine.Quantity)
FROM SaleLine
JOIN Sale ON SaleLine.SaleID = Sale.ID
JOIN Product on SaleLine.ProductId = Product.Id
WHERE Sale.SaleDateTime BETWEEN (CURDATE() - INTERVAL 14 DAY) AND (CURDATE() - INTERVAL 7 DAY)) AS Week2, SUM(SaleLine.Quantity) AS QTY_TO_ORDER
FROM Sale
JOIN SaleLine ON Sale.ID = SaleLine.SaleId
JOIN Product ON SaleLine.ProductId = Product.Id
WHERE Sale.SaleDateTime > (CURDATE() - INTERVAL 7 DAY)
GROUP BY Product.ProductGroupId, Product.Name;
任何人都可以指出即將出現錯誤的第2周(即其返回空)。
任何人都可以想到任何更簡單/更清潔的方式來編碼?
任何人都可以提供一些指針來計算QTY_Order嗎?
預先感謝任何幫助的人能提供:-)
**編輯 - 通過請求添加(customer表中不包括):
的CREATE TABLE語句(也有作爲約束各種觸發不包括)
CREATE TABLE ProductGroup( Id int PRIMARY KEY AUTO_INCREMENT, Name varchar(50) NOT NULL );
CREATE TABLE Product( Id int PRIMARY KEY AUTO_INCREMENT, ProductGroupId int, Name varchar(100) NOT NULL, Price decimal(8,2), QuantityOnHand int NOT NULL, QuantitySold int NOT NULL, QuantityToOrder int NOT NULL, QuantityRequested int NOT NULL, CONSTRAINT FK_Product_ProductGroup FOREIGN KEY (ProductGroupId) REFERENCES ProductGroup(Id) );
CREATE TABLE Sale( Id int PRIMARY KEY AUTO_INCREMENT, CustomerId int, SaleDateTime datetime NOT NULL, CONSTRAINT Sale_Customer FOREIGN KEY (CustomerId) REFERENCES Customer(Id) );
CREATE TABLE SaleLine( Id int PRIMARY KEY AUTO_INCREMENT, ProductId int NOT NULL, SaleId int NOT NULL, Quantity int NOT NULL, CONSTRAINT FK_SaleLine_Product FOREIGN KEY (ProductId) REFERENCES Product(Id), CONSTRAINT FK_SaleLine_Sale FOREIGN KEY (SaleId) REFERENCES Sale(Id) );
雖然你的圖表看起來很漂亮,但有幾個show創建table語句,並且幾行樣例數據會更有用 – e4c5
這被稱爲數據透視表。看看[MySQL數據透視表](http://stackoverflow.com/questions/7674786/mysql-pivot-table)的例子。你將不得不用'sum'來代替'count'。對於您的訂單數量,您需要一個'max(SaleLine.Quantity)AS OrderQty',因爲您只需要一次。 – Solarflare