数据库作业
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）
表2 课程表（course）
表3 成绩表(grade)
表4 教师表(teacher)
表5 等级表(rank)
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。
2、 查询教师所有的单位即不重复的Depart列。
3、 查询Student表的所有记录。
4、 查询Grade表中成绩在60到80之间的所有记录。
5、 查询Grade表中成绩为85，86或88的记录。
6、 查询Student表中“95031”班或性别为“女”的同学记录。
7、 以Class降序查询Student表的所有记录。
8、 以Cno升序、Degree降序查询Grade表的所有记录。
9、 查询“95031”班的学生人数。
10、查询Grade表中的最高分的学生学号和课程号。
11、查询‘3-105’号课程的平均分。
12、查询Grade表中至少有5名学生选修的并以3开头的课程的平均分数。
13、查询最低分大于70，最高分小于90的Sno列。
14、查询所有学生的Sname、Cno和Degree列。
15、查询所有学生的Sno、Cname和Degree列。
16、查询所有学生的Sname、Cname和Degree列。
17、查询“95033”班所选课程的平均分。
mysql> select sname,ssex,class from student;
+--------+------+-------+
| sname | ssex | class |
+--------+------+-------+
| 李军 | 男 | 95033 |
| 陆君 | 男 | 95031 |
| 匡明 | 男 | 95031 |
| 王丽 | 女 | 95033 |
| 曾华 | 男 | 95033 |
| 王芳 | 女 | 95031 |
+--------+------+-------+
6 rows in set (0.00 sec)
mysql> select depart from teacher group by depart;
+-----------------+
| depart |
+-----------------+
| 电子工程系 |
| 计算机系 |
+-----------------+
2 rows in set (0.00 sec)
mysql> select * from student;
+-----+--------+------+---------------------+-------+
| sno | sname | ssex | sbirthday | class |
+-----+--------+------+---------------------+-------+
| 101 | 李军 | 男 | 1976-02-20 00:00:00 | 95033 |
| 103 | 陆君 | 男 | 1974-06-03 00:00:00 | 95031 |
| 105 | 匡明 | 男 | 1975-10-02 00:00:00 | 95031 |
| 107 | 王丽 | 女 | 1976-01-23 00:00:00 | 95033 |
| 108 | 曾华 | 男 | 1977-09-01 00:00:00 | 95033 |
| 109 | 王芳 | 女 | 1975-02-10 00:00:00 | 95031 |
+-----+--------+------+---------------------+-------+
6 rows in set (0.00 sec)
mysql> select * from student where degree=85 or degree=86 or degree=88;
ERROR 1054 (42S22): Unknown column 'degree' in 'where clause'
mysql> select * from grade where degree=85 or degree=86 or degree=88;
+-----+-------+--------+
| sno | cno | degree |
+-----+-------+--------+
| 101 | 6-166 | 85 |
| 103 | 3-245 | 86 |
| 105 | 3-105 | 88 |
+-----+-------+--------+
3 rows in set (0.00 sec)
mysql> select * from grade where degree between 60 and 80;
+-----+-------+--------+
| sno | cno | degree |
+-----+-------+--------+
| 101 | 3-105 | 64 |
| 105 | 3-245 | 75 |
| 107 | 6-106 | 79 |
| 108 | 3-105 | 78 |
| 109 | 3-105 | 76 |
| 109 | 3-245 | 68 |
+-----+-------+--------+
6 rows in set (0.00 sec)
mysql> select * from student where class=95031 or ssex='女';
+-----+--------+------+---------------------+-------+
| sno | sname | ssex | sbirthday | class |
+-----+--------+------+---------------------+-------+
| 103 | 陆君 | 男 | 1974-06-03 00:00:00 | 95031 |
| 105 | 匡明 | 男 | 1975-10-02 00:00:00 | 95031 |
| 107 | 王丽 | 女 | 1976-01-23 00:00:00 | 95033 |
| 109 | 王芳 | 女 | 1975-02-10 00:00:00 | 95031 |
+-----+--------+------+---------------------+-------+
4 rows in set (0.00 sec)
mysql> select * from student order by class desc;
+-----+--------+------+---------------------+-------+
| sno | sname | ssex | sbirthday | class |
+-----+--------+------+---------------------+-------+
| 101 | 李军 | 男 | 1976-02-20 00:00:00 | 95033 |
| 107 | 王丽 | 女 | 1976-01-23 00:00:00 | 95033 |
| 108 | 曾华 | 男 | 1977-09-01 00:00:00 | 95033 |
| 103 | 陆君 | 男 | 1974-06-03 00:00:00 | 95031 |
| 105 | 匡明 | 男 | 1975-10-02 00:00:00 | 95031 |
| 109 | 王芳 | 女 | 1975-02-10 00:00:00 | 95031 |
+-----+--------+------+---------------------+-------+
6 rows in set (0.00 sec)
mysql> select * from grade order by cno,degree desc;
+-----+-------+--------+
| sno | cno | degree |
+-----+-------+--------+
| 103 | 3-105 | 92 |
| 107 | 3-105 | 91 |
| 105 | 3-105 | 88 |
| 108 | 3-105 | 78 |
| 109 | 3-105 | 76 |
| 101 | 3-105 | 64 |
| 103 | 3-245 | 86 |
| 105 | 3-245 | 75 |
| 109 | 3-245 | 68 |
| 107 | 6-106 | 79 |
| 101 | 6-166 | 85 |
| 108 | 6-166 | 81 |
+-----+-------+--------+
12 rows in set (0.00 sec)
mysql> select count() from student where class=95031;
+----------+
| count() |
+----------+
| 3 |
+----------+
1 row in set (0.00 sec)
mysql> select sno,cno from grade order by degree limit 1;
+-----+-------+
| sno | cno |
+-----+-------+
| 101 | 3-105 |
+-----+-------+
1 row in set (0.00 sec)
mysql> select sno,cno from grade order by degree desc limit 1;
+-----+-------+
| sno | cno |
+-----+-------+
| 103 | 3-105 |
+-----+-------+
1 row in set (0.00 sec)
mysql> select avg(degree) from grade;
+-------------+
| avg(degree) |
+-------------+
| 80.2500 |
+-------------+
1 row in set (0.00 sec)
mysql> select avg(degree) from grade where cno='3-105';
+-------------+
| avg(degree) |
+-------------+
| 81.5000 |
+-------------+
1 row in set (0.00 sec)
