DROP TABLE IF EXISTS `course`;
CREATE TABLE `course` (
`Cno` VARCHAR(20) NOT NULL,
`Cname` VARCHAR(20) NOT NULL,
`Tno` VARCHAR(20) NOT NULL
) ENGINE=INNODB DEFAULT CHARSET=utf8;
/*Data for the table `course` */
INSERT INTO `course`(`Cno`,`Cname`,`Tno`) VALUES ('3-105','计算机导论','825'),('3-245','操作系统','804'),('6-166','数字电路','856'),('9-888','高等数学','831');
/*Table structure for table `score` */
CREATE DATABASE test;
CREATE TABLE `score` (
`Sno` VARCHAR(20) NOT NULL,
`Cno` VARCHAR(20) NOT NULL,
`Degree` DECIMAL(4,1) DEFAULT NULL
) ENGINE=INNODB DEFAULT CHARSET=utf8;
/*Data for the table `score` */
INSERT INTO `score`(`Sno`,`Cno`,`Degree`) VALUES ('103','3-245','86.0'),('105','3-245','75.0'),('109','3-245','68.0'),('103','3-105','92.0'),('105','3-105','88.0'),('109','3-105','76.0'),('101','3-105','64.0'),('107','3-105','91.0'),('108','3-105','78.0'),('101','6-166','85.0'),('107','6-166','79.0'),('108','6-166','81.0');
/*Table structure for table `student` */
CREATE TABLE `student` (