我正在为一个游戏租赁店建立一个数据库。除了一件事，一切都运转良好。当我尝试将Orders（table）联接到Staff（table）上时，它在“ on子句”中显示错误“未知列“ Staff.Orders_ID””。现在我工作了，我加入了工作人员（表）到订单（表）上。除薪水查询外，一切工作正常，薪水查询从Orders（table）获取薪水，因此薪水总和将随每次销售而增加。不确定我的表是否与外键或其他东西正确连接。
存储表
USE `mydb` ;
CREATE TABLE IF NOT EXISTS `mydb`.`Store` (
`Store_ID` INT(5) UNSIGNED NOT NULL AUTO_INCREMENT,
`Name` VARCHAR(45) NOT NULL,
`Country` VARCHAR(45) NOT NULL,
`City` VARCHAR(45) NOT NULL,
`Address` VARCHAR(255) NOT NULL,
`Phone` VARCHAR(20) NOT NULL,
`Email` VARCHAR(255) NULL DEFAULT NULL,
`Store_Rent` DECIMAL(9.2) NOT NULL DEFAULT 500,
`Store_Utilities` DECIMAL(9.2) NOT NULL DEFAULT 200,
`Last_Update` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`Store_ID`))
ENGINE = InnoDB AUTO_INCREMENT=1;
库存表
USE `mydb` ;
CREATE TABLE IF NOT EXISTS `mydb`.`Inventory` (
`Inventory_ID` INT(5) UNSIGNED NOT NULL AUTO_INCREMENT,
`Title` VARCHAR(45) NOT NULL DEFAULT "UNKNOWN TITLE",
`Rental_Rate_Per_Day` DECIMAL(4,2) NOT NULL DEFAULT 5.99,
`Supplier_Cost` DECIMAL(4,2) NOT NULL DEFAULT 29.99,
`Units_in_Stock` INT(4) NOT NULL DEFAULT 0,
`Store_ID` INT(5) UNSIGNED NOT NULL,
`Last_Update` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
INDEX `fk_Inventory_Store_idx` (`Store_ID` ASC) VISIBLE,
CONSTRAINT `fk_Inventory_Store`
FOREIGN KEY (`Store_ID`)
REFERENCES `mydb`.`Store` (`Store_ID`)
ON DELETE CASCADE
ON UPDATE CASCADE,
PRIMARY KEY (`Inventory_ID`))
ENGINE = InnoDB AUTO_INCREMENT=1;
职员表
USE `mydb` ;
CREATE TABLE IF NOT EXISTS `mydb`.`Staff` (
`Staff_ID` INT(5) UNSIGNED NOT NULL AUTO_INCREMENT,
`Date_Joined` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
`Name` VARCHAR(45) NOT NULL,
`Country` VARCHAR(45) NOT NULL,
`City` VARCHAR(45) NOT NULL,
`Address` VARCHAR(255) NOT NULL,
`Phone` VARCHAR(20) NOT NULL,
`Email` VARCHAR(255) NULL DEFAULT NULL,
`Salary` DECIMAL(9.2) NOT NULL DEFAULT 2000,
`Store_ID` INT(5) UNSIGNED NOT NULL,
INDEX `fk_Staff_Store_idx` (`Store_ID` ASC) VISIBLE,
CONSTRAINT `fk_Staff_Store`
FOREIGN KEY (`Store_ID`)
REFERENCES `mydb`.`Store` (`Store_ID`)
ON DELETE CASCADE
ON UPDATE CASCADE,
`Last_Update` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`Staff_ID`))
ENGINE = InnoDB AUTO_INCREMENT=1;
订单表
USE `mydb` ;
CREATE TABLE IF NOT EXISTS `mydb`.`Orders` (
`Orders_ID` INT(5) UNSIGNED NOT NULL AUTO_INCREMENT,
`Order_Date` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
`Store_ID` INT(5) UNSIGNED NOT NULL,
`Staff_ID` INT(5) UNSIGNED NOT NULL,
`Inventory_ID` INT(5) UNSIGNED NOT NULL,
`Customer_ID` INT(5) UNSIGNED NOT NULL,
`Return_Date` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
-- `Rental_Number_of_Days` INT(5) NOT NULL,
`Quantity` INT(3) NOT NULL,
`Last_Update` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`Orders_ID`),
INDEX `fk_Orders_Store_idx` (`Store_ID` ASC) VISIBLE,
INDEX `fk_Orders_Staff_idx` (`Staff_ID` ASC) VISIBLE,
INDEX `fk_Orders_Inventory_idx` (`Inventory_ID` ASC) VISIBLE,
INDEX `fk_Orders_Customer_idx` (`Customer_ID` ASC) VISIBLE,
CONSTRAINT `fk_Orders_Store`
FOREIGN KEY (`Store_ID`)
REFERENCES `mydb`.`Store` (`Store_ID`)
ON DELETE CASCADE
ON UPDATE CASCADE,
CONSTRAINT `fk_Orders_Customer`
FOREIGN KEY (`Customer_ID`)
REFERENCES `mydb`.`Customer` (`Customer_ID`)
ON DELETE CASCADE
ON UPDATE CASCADE,
CONSTRAINT `fk_Orders_Staff`
FOREIGN KEY (`Staff_ID`)
REFERENCES `mydb`.`Staff` (`Staff_ID`)
ON DELETE CASCADE
ON UPDATE CASCADE,
CONSTRAINT `fk_Orders_Inventory`
FOREIGN KEY (`Inventory_ID`)
REFERENCES `mydb`.`Inventory` (`Inventory_ID`)
ON DELETE CASCADE
ON UPDATE CASCADE)
ENGINE = InnoDB AUTO_INCREMENT=1;
查询
USE `mydb` ;
CREATE VIEW Expenses_All AS
SELECT Store.Name AS "Store Name",
CAST(SUM(Inventory.Supplier_Cost * Inventory.Units_in_Stock) AS
DECIMAL(5.2)) AS "Value of Games in Stock",
CAST(SUM(Inventory.Rental_Rate_Per_Day * Orders.Quantity *
(datediff(Return_Date, Order_Date))) AS DECIMAL(5.2)) AS "Sales in
Euro",
CAST(SUM(Salary) AS DECIMAL(5.2)) AS "Monthly Salaries",
Store_Rent AS "Monthly Rent Pay",
Store_Utilities AS "Monthly Utilities Pay",
CAST((SUM(Inventory.Rental_Rate_Per_Day * Orders.Quantity *
(datediff(Return_Date, Order_Date)))) - Store_Rent - Store_Utilities
- (SUM(Salary)) AS DECIMAL(5.2)) AS "Monthly Profit"
/*
FROM (((Store -- <-- Unknown column "Store.Orders_ID" in "on clause"
LEFT JOIN Staff ON Store.Staff_ID = Staff.Staff_ID)
LEFT JOIN Inventory ON Store.Inventory_ID = Inventory.Inventory_ID)
LEFT JOIN Orders ON Store.Orders_ID = Orders.Orders_ID)
GROUP BY Store.Store_ID;
*/
FROM (((Orders -- <-- This gives me the wrong salary
LEFT JOIN Staff ON Orders.Staff_ID = Staff.Staff_ID)
LEFT JOIN Inventory ON Orders.Inventory_ID =Inventory.Inventory_ID)
LEFT JOIN Store ON Orders.Store_ID = Store.Store_ID)
GROUP BY Store.Store_ID;
