SQL语句测试

Student(S#,Sname,Sage,Ssex) 学生表       S#：学号；Name：学生姓名；Age：学生年龄；Sex：学生性别
Course(C#,Cname,T#) 课程表                    C#,课程编号；Name：课程名字；T#：教师编号
SC(S#,C#,score) 成绩表                             S#：学号；C#,课程编号；Score：成绩

Teacher(T#,Tname) 教师表                        T#：教师编号； Name：教师名字

1、查询“001”课程比“002”课程成绩高的所有学生的学号；

2、查询没有学全所有课的同学的学号、姓名；
3、查询各科成绩最高和最低的分：以如下形式显示：课程ID，最高分，最低分
4、查询和“1002”号的同学学习的课程完全相同的其他同学学号和姓名；
5、查询各科成绩前三名的学生

一、select SC1.`S#` from SC SC1 JOIN SC SC2 ON SC1.`S#`=SC2.`S#` WHERE SC1.`C#`='1' AND SC2.`C#`='2' AND SC1.Score > SC2.Score

一、select Student.`S#` from (select `s#`,score from SC where `C#`='1') Student,(select `S#`,score from SC where `C#`='2') Course WHERE Student.`S#`=Course.`S#`

二、select Student.`S#`,Student.`Name` from Student,SC where Student.`S#`=SC.`S#`  group by Student.`S#`,Student.`Name`  having count(`C#`)  < (select count(*) from Course)

三、select `C#` as '课程ID',MAX(Score) as '最高分',MIN(Score) as '最低分' from SC group by `C#`

四、select distinct SC.`S#`,Student.`Name` from SC JOIN Student ON SC.`S#`=Student.`S#` where SC.`S#` not in (select `S#` from sc where `C#` not in  (select `C#` from sc where `S#`='2')) AND SC.`S#`<>2 group by SC.`S#` having count(*) = (select count(*) from sc where `S#`='2');


五、SELECT a.`S#` '学生ID',a.`C#` '课程ID',a.Score '分数' FROM sc a WHERE (SELECT COUNT(`C#`) FROM sc WHERE `C#`=a.`C#` AND a.Score<Score)<3 ORDER BY `C#` ASC, Score DESC

/*Navicat MySQL Data TransferSource Server         : windows_mysqlSource Server Version : 50547Source Host           : 127.0.0.1:3306Source Database       : sqlTarget Server Type    : MYSQLTarget Server Version : 50547File Encoding         : 65001Date: 2016-06-28 21:24:49*/SET FOREIGN_KEY_CHECKS=0;-- ------------------------------ Table structure for course-- ----------------------------DROP TABLE IF EXISTS `course`;CREATE TABLE `course` (  `C#` int(11) NOT NULL AUTO_INCREMENT,  `Name` varchar(255) DEFAULT NULL,  `T#` varchar(255) DEFAULT NULL,  PRIMARY KEY (`C#`)) ENGINE=MyISAM AUTO_INCREMENT=6 DEFAULT CHARSET=gbk;-- ------------------------------ Records of course-- ----------------------------INSERT INTO `course` VALUES ('1', '软件工程', '1');INSERT INTO `course` VALUES ('2', '项目优化', '2');INSERT INTO `course` VALUES ('3', '二次开发', '3');INSERT INTO `course` VALUES ('4', '框架实战', '4');INSERT INTO `course` VALUES ('5', 'PHP从入门到放弃', '5');-- ------------------------------ Table structure for sc-- ----------------------------DROP TABLE IF EXISTS `sc`;CREATE TABLE `sc` (  `S#` int(11) DEFAULT NULL,  `C#` int(11) DEFAULT NULL,  `Score` int(255) DEFAULT NULL) ENGINE=MyISAM AUTO_INCREMENT=9 DEFAULT CHARSET=gbk;-- ------------------------------ Records of sc-- ----------------------------INSERT INTO `sc` VALUES ('1', '1', '50');INSERT INTO `sc` VALUES ('2', '1', '123');INSERT INTO `sc` VALUES ('1', '2', '26');INSERT INTO `sc` VALUES ('2', '2', '5');INSERT INTO `sc` VALUES ('5', '3', '23');INSERT INTO `sc` VALUES ('6', '3', '34');INSERT INTO `sc` VALUES ('7', '4', '56');INSERT INTO `sc` VALUES ('2', '4', '78');INSERT INTO `sc` VALUES ('1', '3', '56');INSERT INTO `sc` VALUES ('1', '4', '123');INSERT INTO `sc` VALUES ('2', '3', '12');-- ------------------------------ Table structure for student-- ----------------------------DROP TABLE IF EXISTS `student`;CREATE TABLE `student` (  `S#` int(11) NOT NULL AUTO_INCREMENT,  `Name` varchar(255) DEFAULT NULL,  `Age` int(11) DEFAULT NULL,  `Sex` varchar(255) DEFAULT NULL,  PRIMARY KEY (`S#`)) ENGINE=MyISAM AUTO_INCREMENT=9 DEFAULT CHARSET=gbk;-- ------------------------------ Records of student-- ----------------------------INSERT INTO `student` VALUES ('1', '王浩', '10', '男');INSERT INTO `student` VALUES ('2', '付兴', '11', '女');INSERT INTO `student` VALUES ('3', '刘丹', '11', '男');INSERT INTO `student` VALUES ('4', '赵鑫', '11', '女');INSERT INTO `student` VALUES ('5', '高玉', '11', '男');INSERT INTO `student` VALUES ('6', '李敏', '11', '女');INSERT INTO `student` VALUES ('7', '马军', '11', '男');INSERT INTO `student` VALUES ('8', '江文', '11', '女');-- ------------------------------ Table structure for teacher-- ----------------------------DROP TABLE IF EXISTS `teacher`;CREATE TABLE `teacher` (  `T#` int(11) NOT NULL AUTO_INCREMENT,  `Name` varchar(255) DEFAULT NULL,  PRIMARY KEY (`T#`)) ENGINE=MyISAM AUTO_INCREMENT=6 DEFAULT CHARSET=gbk;-- ------------------------------ Records of teacher-- ----------------------------INSERT INTO `teacher` VALUES ('1', '赵伟');INSERT INTO `teacher` VALUES ('2', '张恩');INSERT INTO `teacher` VALUES ('3', '李朋');INSERT INTO `teacher` VALUES ('4', '张鹏');INSERT INTO `teacher` VALUES ('5', '李明');