用外鍵在C＃中定義兩個表

Question

我想制作2個表：Teams and Projects我要在兩者之間建立1：n關系。 這是我的代碼：//創建tabela項目

    public void CreareTabelaProjects() {
        string query = "CREATE TABLE IF NOT EXISTS Projects" + "(" + "id_project MEDIUMINT PRIMARY KEY AUTO_INCREMENT," + "name VARCHAR(30)," +
            "description VARCHAR(30)," + "FOREIGN KEY (team_id) REFERENCES Teams(team_id)" + ");";
        if (this.OpenConnection() == true) {
            MySqlCommand cmd = new MySqlCommand(query, connection);
            cmd.ExecuteNonQuery();
            this.CloseConnection();
        }
    }

   //Creare tabela Teams

    public void CreareTabelaTeams() {
        string query = "CREATE TABLE IF NOT EXISTS Teams" + "(" + "team_id INT AUTO_INCREMENT PRIMARY KEY," + "name VARCHAR(30)" + ");";
        if (this.OpenConnection() == true)
        {
            MySqlCommand cmd = new MySqlCommand(query, connection);
            cmd.ExecuteNonQuery();
            this.CloseConnection();
        }

    }

當我運行此命令時，發生這樣的錯誤：表中不存在鍵列'team_id'。 該應用程序僅創建團隊表。 有什么幫助嗎？ 謝謝！

Answer 1

在第一個表之前創建第二個表

Answer 2

這是對Project Table的正確查詢

 string query = "CREATE TABLE IF NOT EXISTS Projects" + "(" + "project_id INT AUTO_INCREMENT PRIMARY KEY," + "team_id INT,"+"name VARCHAR(30)," +
            "description VARCHAR(30)," + "FOREIGN KEY (team_id) REFERENCES Teams(team_id)" + ");";

還是非常感謝