sql 練習題

答案不一定正確，部分沒有答案

一、已知有如下表，請用sql語句在mysql里建立相應的表

表1 學生表(student)

列名意義類型約束

sno學號varchar(3)主鍵

sname姓名varchar(4)非空

ssex性別varchar(2)

sbirthday生日datetime

class班級編號varchar(5)非空

表2 課程表(course)

列名意義類型約束

cno課程號varchar(5)主鍵

cname課程名varchar(10)非空

tno教師編號varchar(10)非空

表3 成績表(grade)

列名意義類型約束

sno學號varchar(3)主鍵

cno課程號varchar(5)主鍵

degree分數numeric(3)非空

表4 教師表(teacher)

列名意義類型約束

tno教師編號varchar(3)主鍵

tname教師姓名varchar(10)非空

tsex性別varchar(2)

tbirthday生日datetime

prof職稱varchar(6)非空

depart系varchar(10)非空

表5 等級表(rank)

列名意義類型約束

down分數下屆numeric(3)非空

up分數上界numeric(3)非空

rank級別varchar(1)主鍵

二、將如下數據插入到表里

INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (108 ,'曾華' ,'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 ,'王麗' ,'女' ,1976-01-23,95033);

INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (101 ,'李軍' ,'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 ,'陸君' ,'男' ,1974-06-03,95031);

INSERT INTO COURSE(CNO,CNAME,TNO)VALUES ('3-105' ,'計算機導論', '825')

INSERT INTO COURSE(CNO,CNAME,TNO)VALUES ('3-245' ,'操作系統' , '804');

INSERT INTO COURSE(CNO,CNAME,TNO)VALUES ('6-166' ,'數據電路' , '856');

INSERT INTO COURSE(CNO,CNAME,TNO)VALUES ('9-888' ,'高等數學' , '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,'李誠','男','1958-12-02','副教授','計算機系');

INSERT INTO TEACHER(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART)

VALUES (856,'張旭','男','1969-03-12','講師','電子工程系');

INSERT INTO TEACHER(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART)

VALUES (825,'王萍','女','1972-05-05','助教','計算機系');

INSERT INTO TEACHER(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART)

VALUES (831,'劉冰','女','1977-08-14','助教','電子工程系');

insert into csl.rank(down,up,rank) values(90,100,'A');

insert into csl.rank(down,up,rank) values(80,89,'B');

insert into csl.rank(down,up,rank) values(70,79,'C');

insert into csl.rank(down,up,rank) values(60,69,'D');

insert into csl.rank(down,up,rank) values(0,59,'E');

三、sql語句練習

1、 查詢Student表中的所有記錄的Sname、Ssex和Class列。

select Sname,Ssex,Class from student

2、 查詢教師所有的單位即不重復的Depart列。

select distinct Depart from Teacher

3、 查詢Student表的所有記錄。

select * from student

4、 查詢Grade表中成績在60到80之間的所有記錄。

select * from grade where Degree between 60 and 80

5、 查詢Grade表中成績為85，86或88的記錄。

select * from grade where Degree in ('85','86','88')

6、 查詢Student表中“95031”班或性別為“女”的同學記錄。

select * from student where Class='95031' or Ssex='女'

7、 以Class降序查詢Student表的所有記錄。

select * from student order by Class desc

8、 以Cno升序、Degree降序查詢Grade表的所有記錄。

select * from grade order by Cno asc,Degree desc

9、 查詢“95031”班的學生人數。

select count(*) from student where Class='95031'

10、查詢Grade表中的最高分的學生學號和課程號。

select SNO,CNO from grade where Degree=(select MAX(Degree) from grade)

11、查詢‘3-105’號課程的平均分。

select avg(degree) from grade where cno='3-105';

12、查詢Grade表中至少有5名學生選修的并以3開頭的課程的平均分數。

select AVG(Degree ) from grade where Cno like '3%' group by Cno having COUNT(Cno)>4

13、查詢最低分大于70，最高分小于90的Sno列。

select sno from grade where Degree between 70 and 90

14、查詢所有學生的Sname、Cno和Degree列。

select Sname,Cno,Degree from student join grade on student.Sno=grade.Sno

15、查詢所有學生的Sno、Cname和Degree列。

select Sno,Cname,degree from grade join Course on Course.Cno=grade.Cno

16、查詢所有學生的Sname、Cname和Degree列。

Select student.Sname,Cname,degree from student join grade on student.Sno=grade.Sno join Course on Course.Cno=grade.Cno

17、查詢“95033”班所選課程的平均分。

select AVG(Degree) from grade where Sno in (select Sno from student where Class='95033')

select AVG(Degree) from grade,student where student.Sno=grade.Sno and Class='95033'

---以下題目均需提供兩種sql語句

18、查詢選修課成績為A等的學生信息

select * from grade inner join rank on (grade.degree >= rank.down and grade.degree <= rank.up) inner join student on student.sno=grade.sno where rank = 'A';

19、查詢選修“3-105”課程的成績高于“109”號同學成績的所有同學的記錄。

select * from student,grade where grade.Cno='3-105' and student.Sno=grade.Sno and Score.Degree>(select Degree from grade where Cno='3-105' and Sno='109')

20、查詢grade中選學一門以上課程的同學中分數為非最高分成績的記錄。

select * from grade a where Degree 1)

21、查詢成績高于學號為“109”、課程號為“3-105”的成績的所有記錄。

22、查詢和學號為108的同學同年出生的所有學生的Sno、Sname和Sbirthday列。

23、查詢“張旭“教師任課的學生成績。

24、查詢選修某課程的同學人數多于5人的教師姓名。

25、查詢95033班和95031班全體學生的記錄。

26、查詢存在有85分以上成績的課程Cno.

27、查詢出“計算機系“教師所教課程的成績表。

28、查詢“計算機系”與“電子工程系“不同職稱的教師的Tname和Prof。

29、查詢選修編號為“3-105“課程且成績至少高于選修編號為“3-245”的同學的Cno、Sno和Degree,并按Degree從高到低次序排序。

30、查詢選修編號為“3-105”且成績高于選修編號為“3-245”課程的同學的Cno、Sno和Degree.

31、查詢所有教師和同學的name、sex和birthday.

32、查詢所有“女”教師和“女”同學的name、sex和birthday.

33、查詢成績比該課程平均成績低的同學的成績表。

select * from grade a where a.degree < (

select avg(degree) from grade b group by b.cno having a.cno = b.cno

);

For a in grade:

Sum = 0;

Count = 0

For b in grade:

If b.cno = a.cno

Sum += b.degree

Count+=1

Avg = sum / count

If a.degree < avg:

Print()

34、查詢所有任課教師的Tname和Depart.

35 查詢所有未講課的教師的Tname和Depart.

36、查詢至少有2名男生的班號。

37、查詢Student表中不姓“王”的同學記錄。

38、查詢Student表中每個學生的姓名和年齡。

39、查詢Student表中最大和最小的Sbirthday日期值。

40、以班號和年齡從大到小的順序查詢Student表中的全部記錄。

41、查詢“男”教師及其所上的課程。

42、查詢最高分同學的Sno、Cno和Degree列。

43、查詢和“李軍”同性別的所有同學的Sname.

44、查詢和“李軍”同性別并同班的同學Sname.

45、查詢所有選修“計算機導論”課程的“男”同學的成績表

46、查詢計算機系教師所教課程成績為B等的課程信息

47、查詢成績在C等以上的學生的所在班級

48、查詢班里B等以上學生人數最多的班級信息

mysql> select * from grade;

+-----+-------+--------+

| sno | cno | degree |

+-----+-------+--------+

| 101 | 3-105 | 64 |

| 101 | 6-166 | 85 |

| 103 | 3-105 | 92 |

| 103 | 3-245 | 86 |

| 105 | 3-105 | 88 |

| 105 | 3-245 | 75 |

| 107 | 3-105 | 91 |

| 107 | 6-106 | 79 |

| 108 | 3-105 | 78 |

| 108 | 6-166 | 81 |

+-----+-------+--------+

10 rows in set (0.01 sec)

mysql> select avg(degree) from grade group by cno;

+-------------+

| avg(degree) |

+-------------+

| 82.6000 |

| 80.5000 |

| 79.0000 |

| 83.0000 |

+-------------+

4 rows in set (0.00 sec)

mysql> select cno,avg(degree) from grade group by cno;

+-------+-------------+

| cno | avg(degree) |

+-------+-------------+

| 3-105 | 82.6000 |

| 3-245 | 80.5000 |

| 6-106 | 79.0000 |

| 6-166 | 83.0000 |

+-------+-------------+

4 rows in set (0.00 sec)

mysql> select * from grade a where a.degree < (select avg(degree) from grade b group by b.cno having a.cno = b.cno);

+-----+-------+--------+

| sno | cno | degree |

+-----+-------+--------+

| 101 | 3-105 | 64 |

| 105 | 3-245 | 75 |

| 108 | 3-105 | 78 |

| 108 | 6-166 | 81 |

+-----+-------+--------+

4 rows in set (0.01 sec)

mysql> select * from grade;

+-----+-------+--------+

| sno | cno | degree |

+-----+-------+--------+

| 101 | 3-105 | 64 |

| 101 | 6-166 | 85 |

| 103 | 3-105 | 92 |

| 103 | 3-245 | 86 |

| 105 | 3-105 | 88 |

| 105 | 3-245 | 75 |

| 107 | 3-105 | 91 |

| 107 | 6-106 | 79 |

| 108 | 3-105 | 78 |

| 108 | 6-166 | 81 |

+-----+-------+--------+

10 rows in set (0.00 sec)

mysql>

mysql> select * from teacher;

+-----+--------+------+---------------------+-----------+-----------------+

| tno | tname | tsex | tbirthday | prof | depart |

+-----+--------+------+---------------------+-----------+-----------------+

| 804 | 李誠 | 男 | 1958-12-02 00:00:00 | 副教授 | 計算機系 |

| 825 | 王萍 | 女 | 1972-05-05 00:00:00 | 助教 | 計算機系 |

| 831 | 劉冰 | 女 | 1977-08-14 00:00:00 | 助教 | 電子工程系 |

| 856 | 張旭 | 男 | 1969-03-12 00:00:00 | 講師 | 電子工程系 |

+-----+--------+------+---------------------+-----------+-----------------+

4 rows in set (0.01 sec)

mysql> select * from course;

+-------+-----------------+-----+

| cno | cname | tno |

+-------+-----------------+-----+

| 3-105 | 計算機導論 | 825 |

| 3-245 | 操作系統 | 804 |

| 6-166 | 數據電路 | 856 |

| 9-888 | 高等數學 | 100 |

+-------+-----------------+-----+

4 rows in set (0.01 sec)

mysql> select distinct tno from course ;

+-----+

| tno |

+-----+

| 825 |

| 804 |

| 856 |

| 100 |

+-----+

4 rows in set (0.00 sec)

mysql> select tname,depart from teacher where tno not in(select distinct tno from course);

+--------+-----------------+

| tname | depart |

+--------+-----------------+

| 劉冰 | 電子工程系 |

+--------+-----------------+

1 row in set (0.00 sec)

mysql> select * from teacher t left join course c on t.tno = c.tno;

+-----+--------+------+---------------------+-----------+-----------------+-------+-----------------+------+

| tno | tname | tsex | tbirthday | prof | depart | cno | cname | tno |

+-----+--------+------+---------------------+-----------+-----------------+-------+-----------------+------+

| 825 | 王萍 | 女 | 1972-05-05 00:00:00 | 助教 | 計算機系 | 3-105 | 計算機導論 | 825 |

| 804 | 李誠 | 男 | 1958-12-02 00:00:00 | 副教授 | 計算機系 | 3-245 | 操作系統 | 804 |

| 856 | 張旭 | 男 | 1969-03-12 00:00:00 | 講師 | 電子工程系 | 6-166 | 數據電路 | 856 |

| 831 | 劉冰 | 女 | 1977-08-14 00:00:00 | 助教 | 電子工程系 | NULL | NULL | NULL |

+-----+--------+------+---------------------+-----------+-----------------+-------+-----------------+------+

4 rows in set (0.00 sec)

mysql> select * from teacher t left join course c on t.tno = c.tno and c.cno is null;

+-----+--------+------+---------------------+-----------+-----------------+------+-------+------+

| tno | tname | tsex | tbirthday | prof | depart | cno | cname | tno |

+-----+--------+------+---------------------+-----------+-----------------+------+-------+------+

| 804 | 李誠 | 男 | 1958-12-02 00:00:00 | 副教授 | 計算機系 | NULL | NULL | NULL |

| 825 | 王萍 | 女 | 1972-05-05 00:00:00 | 助教 | 計算機系 | NULL | NULL | NULL |

| 831 | 劉冰 | 女 | 1977-08-14 00:00:00 | 助教 | 電子工程系 | NULL | NULL | NULL |

| 856 | 張旭 | 男 | 1969-03-12 00:00:00 | 講師 | 電子工程系 | NULL | NULL | NULL |

+-----+--------+------+---------------------+-----------+-----------------+------+-------+------+

4 rows in set (0.00 sec)

mysql> select * from teacher t left join course c on t.tno = c.tno where c.cno is null;

+-----+--------+------+---------------------+--------+-----------------+------+-------+------+

| tno | tname | tsex | tbirthday | prof | depart | cno | cname | tno |

+-----+--------+------+---------------------+--------+-----------------+------+-------+------+

| 831 | 劉冰 | 女 | 1977-08-14 00:00:00 | 助教 | 電子工程系 | NULL | NULL | NULL |

+-----+--------+------+---------------------+--------+-----------------+------+-------+------+

1 row in set (0.00 sec)

mysql> select * from student where ssex='男';

+-----+--------+------+---------------------+-------+

| sno | sname | ssex | sbirthday | class |

+-----+--------+------+---------------------+-------+

| 101 | 李軍 | 男 | 1976-02-20 00:00:00 | 95033 |

| 103 | 陸君 | 男 | 1974-06-03 00:00:00 | 95031 |

| 105 | 匡明 | 男 | 1975-10-02 00:00:00 | 95031 |

| 108 | 曾華 | 男 | 1977-09-01 00:00:00 | 95033 |

+-----+--------+------+---------------------+-------+

4 rows in set (0.00 sec)

mysql> select class,count(*) from student where ssex='男' group by class;

+-------+----------+

| class | count(*) |

+-------+----------+

| 95031 | 2 |

| 95033 | 2 |

+-------+----------+

2 rows in set (0.00 sec)

mysql> select class,count(*) from student where ssex='男' group by class having count(*) >=2;

+-------+----------+

| class | count(*) |

+-------+----------+

| 95031 | 2 |

| 95033 | 2 |

+-------+----------+

2 rows in set (0.00 sec)

mysql> select * from student sname not like '王%';

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'not like '王%'' at line 1

mysql> select * from student where sname not like '王%';

+-----+--------+------+---------------------+-------+

| sno | sname | ssex | sbirthday | class |

+-----+--------+------+---------------------+-------+

| 101 | 李軍 | 男 | 1976-02-20 00:00:00 | 95033 |

| 103 | 陸君 | 男 | 1974-06-03 00:00:00 | 95031 |

| 105 | 匡明 | 男 | 1975-10-02 00:00:00 | 95031 |

| 108 | 曾華 | 男 | 1977-09-01 00:00:00 | 95033 |

+-----+--------+------+---------------------+-------+

4 rows in set (0.00 sec)

mysql> select max(sbirthday),min(sbirthday) from student;

+---------------------+---------------------+

| max(sbirthday) | min(sbirthday) |

+---------------------+---------------------+

| 1977-09-01 00:00:00 | 1974-06-03 00:00:00 |

+---------------------+---------------------+

1 row in set (0.00 sec)

mysql> select date_format(max(sbirthday),'%Y-%m-%d'),min(sbirthday) from student;

+----------------------------------------+---------------------+

| date_format(max(sbirthday),'%Y-%m-%d') | min(sbirthday) |

+----------------------------------------+---------------------+

| 1977-09-01 | 1974-06-03 00:00:00 |

+----------------------------------------+---------------------+

1 row in set (0.00 sec)

mysql> select max(degree) from grade;

+-------------+

| max(degree) |

+-------------+

| 92 |

+-------------+

1 row in set (0.00 sec)

mysql> select sno from grade where degree=(select max(degree) from grade);

+-----+

| sno |

+-----+

| 103 |

+-----+

1 row in set (0.00 sec)

mysql> select * from student where ssex=() and class=();

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') and class=()' at line 1

mysql> select * from teacher;

+-----+--------+------+---------------------+-----------+-----------------+

| tno | tname | tsex | tbirthday | prof | depart |

+-----+--------+------+---------------------+-----------+-----------------+

| 804 | 李誠 | 男 | 1958-12-02 00:00:00 | 副教授 | 計算機系 |

| 825 | 王萍 | 女 | 1972-05-05 00:00:00 | 助教 | 計算機系 |

| 831 | 劉冰 | 女 | 1977-08-14 00:00:00 | 助教 | 電子工程系 |

| 856 | 張旭 | 男 | 1969-03-12 00:00:00 | 講師 | 電子工程系 |

+-----+--------+------+---------------------+-----------+-----------------+

4 rows in set (0.00 sec)

mysql> select * from course;

+-------+-----------------+-----+

| cno | cname | tno |

+-------+-----------------+-----+

| 3-105 | 計算機導論 | 825 |

| 3-245 | 操作系統 | 804 |

| 6-166 | 數據電路 | 856 |

| 9-888 | 高等數學 | 100 |

+-------+-----------------+-----+

4 rows in set (0.01 sec)

mysql> select cno from teacher t join course c on t.tno = c.tno;

+-------+

| cno |

+-------+

| 3-105 |

| 3-245 |

| 6-166 |

+-------+

3 rows in set (0.00 sec)

mysql> select * from grade where cno in (select cno from teacher t join course c on t.tno = c.tno);

+-----+-------+--------+

| sno | cno | degree |

+-----+-------+--------+

| 101 | 3-105 | 64 |

| 101 | 6-166 | 85 |

| 103 | 3-105 | 92 |

| 103 | 3-245 | 86 |

| 105 | 3-105 | 88 |

| 105 | 3-245 | 75 |

| 107 | 3-105 | 91 |

| 108 | 3-105 | 78 |

| 108 | 6-166 | 81 |

+-----+-------+--------+

9 rows in set (0.00 sec)

mysql> select * from grade where cno in (select cno from teacher t join course c on t.tno = c.tno) and d

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