数据库练习及答案

数据库结构
创建四张表 分别存储 学生信息 课程信息 分数 讲师信息表 存储相应数据
学生信息表 Student
字段名 字段类型 字段约束 / 含义
Sno Varchar(3) Not null / 学员编号
Sname Varchar(4) Not null / 学员姓名
Ssex Varchar(2) Not null / 性别
Sbirthday Datetime 生日
Classnum Varchar(5) 班级号

CREATE TABLE STUDENT
(
SNO VARCHAR(3) NOT NULL,
SNAME VARCHAR(4) NOT NULL,
SSEX VARCHAR(2) NOT NULL,
SBIRTHDAY DATETIME,
CLASS VARCHAR(5)
)
课程信息表 course
字段名 字段类型 字段约束 / 含义
Cno Varchar(5) Not null / 课程编号
Cname Varchar(10) Not null / 课程名称
Tno Varchar(10) Not null / 授课老师编号

CREATE TABLE COURSE
(CNO VARCHAR(5) NOT NULL,
CNAME VARCHAR(10) NOT NULL,
TNO VARCHAR(10) NOT NULL)
成绩表score
字段名 字段类型 字段约束 / 含义
Sno Varchar(3) Not null / 学员编号
Cno Varchar(5) Not null / 课程编号
Degree Double(3,1) Not null / 分数

CREATE TABLE SCORE
(SNO VARCHAR(3) NOT NULL,
CNO VARCHAR(5) NOT NULL,
DEGREE NUMERIC(10, 1) NOT NULL)
讲师表teacher
字段名 字段类型 字段约束 / 含义
Tno Varchar(3) Not null / 讲师编号
Tname Varchar(4) Not null / 讲师姓名
Tsex Varchar(2) Not null / 讲师性别
Tbirthday Datetime Not null / 出生日期
Prof Varchar(6) 等级
Depart Varchar(10) 所属院系

CREATE TABLE TEACHER
(TNO VARCHAR(3) NOT NULL,
TNAME VARCHAR(4) NOT NULL, TSEX VARCHAR(2) NOT NULL,
TBIRTHDAY DATETIME NOT NULL, PROF VARCHAR(6),
DEPART VARCHAR(10) NOT NULL);

向表中存储数据
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);
GO
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);
GO
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (103,'3-245',86);
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (105,'3-245',75);
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (109,'3-245',68);
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (103,'3-105',92);
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (105,'3-105',88);
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (109,'3-105',76);
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (101,'3-105',64);
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (107,'3-105',91);
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (108,'3-105',78);
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (101,'6-166',85);
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (107,'6-106',79);
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (108,'6-166',81);
GO
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');

1、 查询Student表中的所有记录的Sname、Ssex和Class列。

select Sname, Ssex, Class from student;

2、 查询教师所有的单位即不重复的Depart列。

select distinct Depart from teacher;

3、 查询Student表的所有记录。

select * from student;

4、 查询Score表中成绩在60到80之间的所有记录。
select DEGREE from score where DEGREE >= 60 and DEGREE = 5;
13、查询最低分大于70,最高分小于90的Sno列。
select sno from score group by SNO having min(DEGREE) > 70 and max(DEGREE) (select DEGREE from score where SNO = '109' and SCORE.CNO='3-105') ;

20、查询score中选学一门以上课程的同学中分数为非最高分成绩的记录。
select DEGREE,SNO,CNO
from SCORE
where SNO in (select SNO
from SCORE
group by SNO
having count(CNO) > 1) and DEGREE 5);
25、查询95033班和95031班全体学生的记录。
select * from student where CLASS='95033' or CLASS='95031';
26、查询存在有85分以上成绩的课程Cno.
select SCORE.CNO from course,score where SCORE.CNO=COURSE.CNO group by CNO having max(DEGREE) >= 85;
27、查询出“计算机系“教师所教课程的成绩表。
select x.CNO,x.SNO,x.DEGREE from score x,course y,teacher z where x.CNO=y.CNO
and y.TNO=z.TNO
and DEPART = '计算机系';
select * from score where cno in(select x.cno from course x,teacher y where y.tno=x.tno and y.depart='计算机系');
28、查询“计算机系”与“电子工程系“不同职称的教师的Tname和Prof。
select tname,prof from teacher where depart='计算机系' and prof not in (select prof from teacher where depart='电子工程系');
29、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”的同学的Cno、
Sno和Degree,并按Degree从高到低次序排序。
select * from score where cno='3-105' and degree>all (select degree from score where cno='3-245')order by degree desc;
30、查询选修编号为“3-105”且成绩高于选修编号为“3-245”课程的同学的Cno、Sno和
Degree.
select * from score where cno='3-105' and degree>all(select degree from score where cno='3-245');
31、查询所有教师和同学的name、sex和birthday.
select tname,tsex,tbirthday from teacher union select sname,ssex,sbirthday from student;
32、查询所有“女”教师和“女”同学的name、sex和birthday.
select tname,tsex,tbirthday from teacher where tsex='女' union select sname,ssex,sbirthday from student where ssex='女';
33、查询成绩比该课程平均成绩低的同学的成绩表。
select * from score x where DEGREE =2;
37、查询Student表中不姓“王”的同学记录。
select * from student where sname not like'王_';
38、查询Student表中每个学生的姓名和年龄。
select SNAME,SBIRTHDAY from student;
39、查询Student表中最大和最小的Sbirthday日期值。
select SBIRTHDAY from student where SBIRTHDAY in (select max(SBIRTHDAY) from student)
or SBIRTHDAY in (select min(SBIRTHDAY) from student);
40、以班号和年龄从大到小的顺序查询Student表中的全部记录。
select class,sname,sbirthday from student order by class desc,sbirthday;
41、查询“男”教师及其所上的课程。
select x.tname,y.cname from teacher x,course y where x.tno=y.tno and x.tsex='男';
42、查询最高分同学的Sno、Cno和Degree列。
select * from score where degree=(select max(degree)from score);
43、查询和“李军”同性别的所有同学的Sname.
select sname from student where ssex=(select ssex from student where sname='李军');
44、查询和“李军”同性别并同班的同学Sname.
select sname from student where ssex=(select ssex from student where sname='李军') and class=(select class from student where sname='李军');
45、查询所有选修“计算机导论”课程的“男”同学的成绩表
select * from score where sno in(select sno from student where ssex='男') and cno=(select cno from course where cname='计算机导论');


作者:返璞归真c

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