SQL FIDLE中的桥接表错误

我在Sql FIDLE中遇到以下错误：

Schema Creation Failed: Incorrect syntax near the keyword 'FOREIGN'.:   

以下是我的创建表脚本：

我正在做一个项目，在这个项目中，服务器上还没有设置DB，我正在尝试删除一些脚本。根据我的语法，SQL Server的语法是正确的，请尝试：

CREATE TABLE Employees(
  UserName_ID varchar(255) NOT NULL,
  Password    varchar(255) NOT NULL,
  F_Name      varchar(255) NOT NULL,
  L_Name      varchar(255) NOT NULL,
  Email       varchar(255) NOT NULL,
  CONSTRAINT Employees_PK  PRIMARY KEY(UserName_ID));

CREATE TABLE Training_Sessions (
    Session_ID          int IDENTITY (1,1) NOT NULL ,
    Session_Name        varchar(255)       NOT NULL,
    Session_Description varchar(255)       NOT NULL,
    Session_Date        varchar(255)       NOT NULL,
    Organizer           varchar(255)       NOT NULL,
    CONSTRAINT Training_Sessions_PK        PRIMARY KEY(Session_ID));

CREATE TABLE Enrolled
(
    UserName_ID varchar(255) NOT NULL,
    Session_ID  int          NOT NULL,
    CONSTRAINT PK_Enrolled   PRIMARY KEY
    (
        UserName_ID,
        Session_ID
    ),
    CONSTRAINT user_fk FOREIGN KEY (UserName_ID) REFERENCES Employees(UserName_ID),
    CONSTRAINT sess_fk FOREIGN KEY (Session_ID)  REFERENCES Training_Sessions(Session_ID)
);

---

您将分号放错了位置，并且忘记在约束后加逗号。投票结束是一个打字错误。

CREATE TABLE Employees(
  UserName_ID varchar(255) NOT NULL,
  Password    varchar(255) NOT NULL,
  F_Name      varchar(255) NOT NULL,
  L_Name      varchar(255) NOT NULL,
  Email       varchar(255) NOT NULL,
  CONSTRAINT Employees_PK  PRIMARY KEY(UserName_ID));

CREATE TABLE Training_Sessions (
    Session_ID          int IDENTITY (1,1) NOT NULL ,
    Session_Name        varchar(255)       NOT NULL,
    Session_Description varchar(255)       NOT NULL,
    Session_Date        varchar(255)       NOT NULL,
    Organizer           varchar(255)       NOT NULL,
    CONSTRAINT Training_Sessions_PK        PRIMARY KEY(Session_ID));

CREATE TABLE Enrolled
(
    UserName_ID varchar(255) NOT NULL,
    Session_ID  int          NOT NULL,
    CONSTRAINT PK_Enrolled   PRIMARY KEY
    (
        UserName_ID,
        Session_ID
    ),
    CONSTRAINT user_fk FOREIGN KEY (UserName_ID) REFERENCES Employees(UserName_ID),
    CONSTRAINT sess_fk FOREIGN KEY (Session_ID)  REFERENCES Training_Sessions(Session_ID)
);