Table Relations - Problem 1. One-To-One Relationship (MSSQL) - Софтуерен университет

Table Relations - Problem 1. One-To-One Relationship (MSSQL)

Здравейте,

Бихте ли ми казали къде е грешката, защото така и не можах да изкарам 100/100 точки в judge системата ? Дава ми 33/100.

Ето и кода ми:

CREATE TABLE Cities (
   CityID INT NOT NULL,
   CityName NVARCHAR(50),
   )

CREATE TABLE Customers(
   CustomerID INT NOT NULL,
   FirstName NVARCHAR(50),
   Salary DECIMAL(10,2),
   CityID INT
   )

INSERT INTO Cities (CityID, CityName)
VALUES (101,'Montana'), (102,'Asenovgrad'), (103,'Karlovo')

INSERT INTO Customers (CustomerID, FirstName, Salary, CityID)
VALUES (1,'Roberto',43300.00,102), (2,'Tom',56100.00,101), (3,'Yana',60200.00,101)

ALTER TABLE Customers
ADD CONSTRAINT PK_CustomerID PRIMARY KEY (CustomerID)

ALTER TABLE Cities
ADD CONSTRAINT PK_CityID PRIMARY KEY (CityID)

ALTER TABLE Customers
ADD CONSTRAINT FK_Customers_Cities FOREIGN KEY (CityID)
REFERENCES Cities(CityID)

SELECT COUNT(*)
FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS
WHERE TABLE_NAME = 'Customers'

Благодаря предварително :)