sql in interview for a job

1、mysql下建表及插入数据

/*
Navicat MySQL Data Transfer

Source Server         : mysql
Source Server Version : 50640
Source Host           : localhost:3306
Source Database       : test

Target Server Type    : MYSQL
Target Server Version : 50640
File Encoding         : 65001

Date: 2018-11-22 18:24:08
*/

SET FOREIGN_KEY_CHECKS=0;

-- ----------------------------
-- Table structure for cource
-- ----------------------------
DROP TABLE IF EXISTS `cource`;
CREATE TABLE `cource` (
  `cno` int(3) unsigned NOT NULL AUTO_INCREMENT COMMENT '课程编号',
  `cname` varchar(20) DEFAULT NULL COMMENT '课程名称',
  PRIMARY KEY (`cno`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8 COMMENT='课程表';

-- ----------------------------
-- Records of cource
-- ----------------------------
INSERT INTO `cource` VALUES ('1', '语文');
INSERT INTO `cource` VALUES ('2', '数学');
INSERT INTO `cource` VALUES ('3', '英语');

-- ----------------------------
-- Table structure for score
-- ----------------------------
DROP TABLE IF EXISTS `score`;
CREATE TABLE `score` (
  `sno` int(3) unsigned DEFAULT NULL COMMENT '学生编号',
  `cno` int(3) unsigned DEFAULT NULL COMMENT '课程编号',
  `score` int(3) unsigned DEFAULT NULL COMMENT '考试成绩'
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='学生成绩表';

-- ----------------------------
-- Records of score
-- ----------------------------
INSERT INTO `score` VALUES ('1', '1', '63');
INSERT INTO `score` VALUES ('1', '2', '61');
INSERT INTO `score` VALUES ('2', '1', '80');

-- ----------------------------
-- Table structure for student
-- ----------------------------
DROP TABLE IF EXISTS `student`;
CREATE TABLE `student` (
  `sno` int(3) unsigned NOT NULL AUTO_INCREMENT COMMENT '学生编号',
  `sname` varchar(20) DEFAULT NULL COMMENT '学生姓名',
  `sage` int(3) unsigned DEFAULT NULL COMMENT '学生年龄',
  PRIMARY KEY (`sno`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8 COMMENT='学生表';

-- ----------------------------
-- Records of student
-- ----------------------------
INSERT INTO `student` VALUES ('1', '周杰伦', '18');
INSERT INTO `student` VALUES ('2', '周润发', '18');
INSERT INTO `student` VALUES ('3', '吴孟达', '25');
INSERT INTO `student` VALUES ('4', '刘德华', '25');
INSERT INTO `student` VALUES ('5', '李连杰', '29');

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