Mysql 编程错误：1064（42000）：您的SQL语法有错误；无法使用外键创建表

我对mysql-python还不熟悉，并参考了它。 以下是我的疑问-

TABLES['doctor_details'] = (
                                "CREATE TABLE `doctor_details` ("
                                 " `dr_id` bigint NOT NULL AUTO_INCREMENT,"
                                 " `doctor_link` varchar(40),"
                                 " `doctor_name` varchar(40) NOT NULL,"
                                 " `doctor_exp_years` float,"
                                 " `doctor_qualification` varchar(40),"
                                 " `doctor_phone_no` varchar(15),"
                                 " `doctor_city` varchar(40),"
                                 " `doctor_state` varchar(40),"
                                 " `doctor_country` varchar(40),"
                                 " `doctor_speciality` varchar(40),"
                                 " `doctor_website_link` varchar(40),"
                                 " `status` int NOT NULL,"
                                 " PRIMARY KEY (`dr_id`)"
                                ") ENGINE=InnoDB")

        TABLES['hospital_details'] = (
                                "CREATE TABLE `hospital_details` ("
                                "  `hospital_id` bigint NOT NULL AUTO_INCREMENT,"
                                "  `dr_id` bigint NOT NULL,"
                                "  `hospital_link` varchar(40),"
                                "  `hospital_name` varchar(40),"
                                "  `hospital_address` varchar(40),"
                                "  `hospital_city` varchar(40),"
                                 "  `hospital_state` varchar(40),"
                                 "  `hospital_country` varchar(40),"
                                 "  `hospital_phone_no` varchar(15),"   
                                 "  `hospital_speciality` varchar(40),"
                                 "  `doctor_link` varchar(40),"
                                 "  `hospital_website_link` varchar(40),"
                                "   PRIMARY KEY (`hospital_id`)"
                                "   CONSTRAINT `dr_idfk` FOREIGN KEY (`dr_id`)"
                                "    REFERENCES `doctor_details` (`dr_id`) ON DELETE NO ACTION" 
                                ") ENGINE=InnoDB")
        self.cursor.execute( TABLES['doctor_details'])
        self.cursor.execute( TABLES['hospital_details'])

它给了我以下的错误-

编程错误：1064（42000）：您的SQL语法有错误；检查与您的MySQL服务器版本对应的手册，以了解使用near'CONSTRAINT

dr_idfk

外键（

dr_id

）的正确语法参考

doctor_details

（'dr_i'位于第1行

如果我犯了一些愚蠢的错误，我表示歉意，但欢迎任何形式的指导/帮助

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非常感谢。

这行后面缺少一个逗号

PRIMARY KEY (`hospital_id`)"

应该如此

PRIMARY KEY (`hospital_id`),"

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再说一次，我不做Python，所以我觉得这一切都像希腊语。

@Drew-非常感谢它解决了我的编程错误：1064（42000）：很抱歉这么愚蠢！很乐意帮忙。请在高兴的时候用绿色复选标记（或任何其他答案）将答案标记为已回答。