Колеги, решението по-долу върви при мен и създава базата данни по E/R диаграмата, но JUDGE дава само 66/100. Някой може ли да погледне и да каже къде бъркам.

CREATE TABLE Cities
(
    CityID INT PRIMARY KEY,
    Name VARCHAR(50) NOT NULL
)

CREATE TABLE Customers
(
    CustomerID INT PRIMARY KEY,
    Name VARCHAR(50) NOT NULL,
    Birthday DATE,
    CityID INT NOT NULL,
    CONSTRAINT FK_Customers_Cities FOREIGN KEY (CityID) REFERENCES Cities(CityID)
)

CREATE TABLE Orders
(
    OrderId INT PRIMARY KEY,
    CustomerId INT NOT NULL,
    CONSTRAINT FK_Orders_Customers FOREIGN KEY (CustomerID) REFERENCES Customers(CustomerID)
)

CREATE TABLE ItemTypes
(
    ItemTypeID INT PRIMARY KEY,
    Name VARCHAR(50) NOT NULL
)

CREATE TABLE Items
(
    ItemID INT PRIMARY KEY,
    Name VARCHAR(50) NOT NULL,
    ItemTypeID INT NOT NULL,
    CONSTRAINT FK_Items_ItemTypes FOREIGN KEY(ItemTypeID) REFERENCES ItemTypes(ItemTypeID)
)

CREATE TABLE OrderItems
(
    OrderID INT NOT NULL,
    ItemID INT NOT NULL,
    CONSTRAINT PK_OrderItems PRIMARY KEY(OrderID,ItemID),
    CONSTRAINT FK_OrderItems_Orders FOREIGN KEY (OrderID) REFERENCES Orders(OrderID),
    CONSTRAINT FK_OrderItems_Items FOREIGN KEY (ItemID) REFERENCES Items(ItemID)
)