一、已知有如下表，请用sql语句在mysql里建立相应的表
表1 学生表（student）
| 列名 | 意义 | 类型 | 约束 |
|---|---|---|---|
| sno | 学号 | varchar(3) | 主键 |
| sname | 姓名 | varchar(10) | 非空 |
| ssex | 性别 | varchar(3) | |
| sbirthday | 生日 | datetime | |
| class | 班级编号 | varchar(5) | 非空 |
表2 课程表（course）
| 列名 | 意义 | 类型 | 约束 |
|---|---|---|---|
| cno | 课程号 | varchar(10) | 主键 |
| cname | 课程名 | varchar(30) | 非空 |
| tno | 教师编号 | varchar(10) | 非空 |
表3 成绩表(grade)
| 列名 | 意义 | 类型 | 约束 |
|---|---|---|---|
| sno | 学号 | varchar(3) | 主键 |
| cno | 课程号 | varchar(5) | 主键 |
| degree | 分数 | tinyint | 非空 |
表4 教师表(teacher)
| 列名 | 意义 | 类型 | 约束 |
|---|---|---|---|
| tno | 教师编号 | varchar(5) | 主键 |
| tname | 教师姓名 | varchar(20) | 非空 |
| tsex | 性别 | varchar(2) | |
| tbirthday | 生日 | datetime | |
| prof | 职称 | varchar(20) | 非空 |
| depart | 系 | varchar(30) | 非空 |
表5 等级表(rank)
| 列名 | 意义 | 类型 | 约束 |
|---|---|---|---|
| down | 分数下届 | tinyint | 非空 |
| up | 分数上界 | tinyint | 非空 |
| rank | 级别 | varchar(2) | 主键 |
SQL语句：
CREATE TABLE `student` (
`sno` varchar(3) NOT NULL,
`sname` varchar(10) NOT NULL,
`ssex` varchar(3) NOT NULL,
`sbirthday` datetime NOT NULL,
`class` varchar(5) NOT NULL,
PRIMARY KEY (`sno`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
CREATE TABLE `course` (
`cno` varchar(10) NOT NULL,
`cname` varchar(30) NOT NULL,
`tno` varchar(10) NOT NULL,
PRIMARY KEY (`cno`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
CREATE TABLE `grade` (
`sno` varchar(3) NOT NULL,
`cno` varchar(5) NOT NULL,
`degree` tinyint(4) NOT NULL,
PRIMARY KEY (`sno`,`cno`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
CREATE TABLE `teacher` (
`tno` varchar(5) NOT NULL,
`tname` varchar(20) NOT NULL,
`tsex` varchar(2) NOT NULL,
`tbirthday` datetime NOT NULL,
`prof` varchar(20) NOT NULL,
`depart` varchar(30) NOT NULL,
PRIMARY KEY (`tno`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
CREATE TABLE `rank` (
`down` tinyint(4) NOT NULL,
`up` tinyint(4) NOT NULL,
`rank` varchar(2) NOT NULL,
PRIMARY KEY (`rank`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
二、将如下数据插入到表里
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (108 ,'曾华' ,'男' , '1977-09-01',95033);
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (105 ,'匡明' ,'男' ,’1975-10-02’,95031);
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (107 ,'王丽' ,'女' ,’1976-01-23’, 95033);
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (101 ,'李军' ,'男' ,’1976-02-20’,95033);
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (109 ,'王芳' ,'女' ,’1975-02-10’,95031);
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (103 ,'陆君' ,'男' ,’1974-06-03’,95031);
INSERT INTO COURSE(CNO,CNAME,TNO)VALUES ('3-105' ,'计算机导论', '825');
INSERT INTO COURSE(CNO,CNAME,TNO)VALUES ('3-245' ,'操作系统' , '804');
INSERT INTO COURSE(CNO,CNAME,TNO)VALUES ('6-166' ,'数据电路' , '856');
INSERT INTO COURSE(CNO,CNAME,TNO)VALUES ('9-888' ,'高等数学' , '100');
INSERT INTO GRADE(SNO,CNO,DEGREE)VALUES ('103','3-245',86);
INSERT INTO GRADE(SNO,CNO,DEGREE)VALUES (105,'3-245',75);
INSERT INTO GRADE(SNO,CNO,DEGREE)VALUES (109,'3-245',68);
INSERT INTO GRADE(SNO,CNO,DEGREE)VALUES (103,'3-105',92);
INSERT INTO GRADE(SNO,CNO,DEGREE)VALUES (105,'3-105',88);
INSERT INTO GRADE(SNO,CNO,DEGREE)VALUES (109,'3-105',76);
INSERT INTO GRADE(SNO,CNO,DEGREE)VALUES (101,'3-105',64);
INSERT INTO GRADE(SNO,CNO,DEGREE)VALUES (107,'3-105',91);
INSERT INTO GRADE(SNO,CNO,DEGREE)VALUES (108,'3-105',78);
INSERT INTO GRADE(SNO,CNO,DEGREE)VALUES (101,'6-166',85);
INSERT INTO GRADE(SNO,CNO,DEGREE)VALUES (107,'6-106',79);
INSERT INTO GRADE(SNO,CNO,DEGREE)VALUES (108,'6-166',81);
INSERT INTO TEACHER(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART)
VALUES (804,'李诚','男','1958-12-02','副教授','计算机系');
INSERT INTO TEACHER(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART)
VALUES (856,'张旭','男','1969-03-12','讲师','电子工程系');
INSERT INTO TEACHER(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART)
VALUES (825,'王萍','女','1972-05-05','助教','计算机系');
INSERT INTO TEACHER(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART)
VALUES (831,'刘冰','女','1977-08-14','助教','电子工程系');
insert into rank(down,up,rank) values(90,100,'A');
insert into rank(down,up,rank) values(80,89,'B');
insert into rank(down,up,rank) values(70,79,'C');
insert into rank(down,up,rank) values(60,69,'D');
insert into rank(down,up,rank) values(0,59,'E');
三、sql语句练习
1、 查询Student表中的所有记录的Sname、Ssex和Class列。
select sname,ssex,class from student
2、查询“张旭“教师任课的学生成绩。
select g.degree from grade as g join course as c on g.cno=c.cno join teacher as t on c.tno=t.tno where t.tname='张旭';
3、查询选修某课程的同学人数多于5人的教师姓名。
select tname from teacher where tno in (select tno from course where cno in (select cno from grade group by cno having count(cno)>5));
4、查询95033班和95031班全体学生的记录。
Select * from student where class in (‘95033’, ‘95031’)
5、查询存在有85分以上成绩的课程Cno.
Select distinct cno from grade where degree>85;
6、查询出“计算机系“教师所教课程的成绩表。
select degree from grade where cno in (select cno from course where tno in (select tno from teacher where depart='计算机系'));
7、查询选修编号为“3-105“课程且成绩至少高于选修编号为“3-245”的同学最低分的Cno、Sno和Degree,并按Degree从高到低次序排序。
select sno,cno,degree from grade where cno='3-105' and degree>(select min(degree) from grade where cno='3-245') order by degree desc;
8、查询同时选修编号为“3-105”和“3-245”并且“3-105”成绩高于“3-245”成绩的同学的Cno、Sno和Degree.
select g1.sno from grade as g1 join grade as g2 on g1.sno=g2.sno where g1.cno='3-105' and g2.cno='3-245' and g1.degree > g2.degree;
9、查询所有教师和同学的name、sex和birthday.
select sname,ssex,sbirthday from student union select tname,tsex,tbirthday from teacher;
10、查询所有“女”教师和“女”同学的name、sex和birthday.
select sname,ssex,sbirthday from student where ssex=’女’ union select tname,tsex,tbirthday from teacher where tsex=’女’;