sql 经典练习题

use fuxi;

CREATE TABLE STUDENT
(
SNO VARCHAR(3) NOT NULL,
SNAME VARCHAR(4) NOT NULL,
SSEX VARCHAR(2) NOT NULL,
SBIRTHDAY DATETIME,
CLASS VARCHAR(5)
);

CREATE TABLE COURSE
(
CNO VARCHAR(5) NOT NULL,
CNAME VARCHAR(10) NOT NULL,
TNO VARCHAR(10) NOT NULL
);

CREATE TABLE SCORE
(
SNO VARCHAR(3) NOT NULL,
CNO VARCHAR(5) NOT NULL,
DEGREE NUMERIC(10, 1) NOT NULL
);

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
);

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 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 (101, ‘6-166’, 85);
INSERT INTO SCORE (SNO, CNO, DEGREE) VALUES (107, ‘6-106’, 79);
INSERT INTO SCORE (SNO, CNO, DEGREE) VALUES (108, ‘3-105’, 78);
INSERT INTO SCORE (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’);

– 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 TEACHER1;

– 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 *
from SCORE
where DEGREE > 60 and DEGREE < 80;

– 5、 查询Score表中成绩为85，86或88的记录。
select *
from SCORE
where DEGREE = 85 or DEGREE = 86 or DEGREE = 88;

– 6、 查询Student表中“95031”班或性别为“女”的同学记录。
select *
from STUDENT
where CLASS = ‘95031’ or SSEX = ‘女’;

– 7、 以Class降序查询Student表的所有记录。
select *
from STUDENT
order by CLASS desc;

– 8、 以Cno升序、Degree降序查询Score表的所有记录。
select *
from SCORE
order by CNO asc, DEGREE desc;

– 9、 查询“95031”班的学生人数。
select count(*)
from STUDENT
where CLASS = ‘95031’;

– 10、查询Score表中的最高分的学生学号和课程号。
select
sno,
CNO
from SCORE
where DEGREE = (
select max(DEGREE)
from SCORE
);

– 11、查询‘3-105’号课程的平均分。
select avg(DEGREE)
from SCORE
where CNO = ‘3-105’;

– 12、查询Score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。
select
avg(DEGREE),
CNO
from SCORE
where cno like ‘3%’
group by CNO
having count(*) > 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) < 90;

– 14、查询所有学生的Sname、Cno和Degree列。
select
SNAME,
CNO,
DEGREE
from STUDENT, SCORE
where STUDENT.SNO = SCORE.SNO;

– 15、查询所有学生的Sno、Cname和Degree列。
select
SCORE.SNO,
CNO,
DEGREE
from STUDENT, SCORE
where STUDENT.SNO = SCORE.SNO;

– 16、查询所有学生的Sname、Cname和Degree列。
SELECT
A.SNAME,
B.CNAME,
C.DEGREE
FROM STUDENT A
JOIN (COURSE B, SCORE C)
ON A.SNO = C.SNO AND B.CNO = C.CNO;

– 17、查询“95033”班所选课程的平均分。
select avg(DEGREE)
from SCORE
where sno in (select SNO
from STUDENT
where CLASS = ‘95033’);

– 18、假设使用如下命令建立了一个grade表：
create table grade (
low numeric(3, 0),
upp numeric(3),
rank char(1)
);
insert into grade values (90, 100, ‘A’);
insert into grade values (80, 89, ‘B’);
insert into grade values (70, 79, ‘C’);
insert into grade values (60, 69, ‘D’);
insert into grade values (0, 59, ‘E’);
– 现查询所有同学的Sno、Cno和rank列。
SELECT
A.SNO,
A.CNO,
B.RANK
FROM SCORE A, grade B
WHERE A.DEGREE BETWEEN B.LOW AND B.UPP
ORDER BY RANK;

– 19、查询选修“3-105”课程的成绩高于“109”号同学成绩的所有同学的记录。
select *
from SCORE
where CNO = ‘3-105’ and DEGREE > ALL (
select DEGREE
from SCORE
where SNO = ‘109’
);

set @@global.sql_mode = ‘STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION’;
set sql_mode = ‘STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION’;

– 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 *
from SCORE
where DEGREE < (select MAX(DEGREE)
from SCORE)
group by SNO
having count(*) > 1;

– 21、查询成绩高于学号为“109”、课程号为“3-105”的成绩的所有记录。
– 同19

– 22、查询和学号为108的同学同年出生的所有学生的Sno、Sname和Sbirthday列。
select
SNO,
SNAME,
SBIRTHDAY
from STUDENT
where year(SBIRTHDAY) = (
select year(SBIRTHDAY)
from STUDENT
where SNO = ‘108’
);

– 23、查询“张旭“教师任课的学生成绩。
select *
from SCORE
where cno = (
select CNO
from COURSE
inner join TEACHER on COURSE.TNO = TEACHER.TNO and TNAME = ‘张旭’
);

– 24、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 = (
select TNO
from COURSE
where CNO = (select CNO
from SCORE
group by CNO
having count(SNO) > 5)
);

– 25、查询95033班和95031班全体学生的记录。
select *
from STUDENT
where CLASS in (‘95033’, ‘95031’);

– 26、查询存在有85分以上成绩的课程Cno.
select cno
from SCORE
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 *
from SCORE
where CNO in (select CNO
from TEACHER, COURSE
where DEPART = ‘计算机系’ and COURSE.TNO = TEACHER.TNO);

– 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
CNO,
SNO,
DEGREE
from SCORE
where CNO = ‘3-105’ and DEGREE > any (
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 DEGREE > ALL (
SELECT DEGREE
FROM SCORE
WHERE CNO = ‘3-245’
)
ORDER by DEGREE desc;

– 31、查询所有教师和同学的name、sex和birthday.
select
TNAME name,
TSEX sex,
TBIRTHDAY birthday
from TEACHER
union
select
sname name,
SSEX sex,
SBIRTHDAY birthday
from STUDENT;

– 32、查询所有“女”教师和“女”同学的name、sex和birthday.
select
TNAME name,
TSEX sex,
TBIRTHDAY birthday
from TEACHER
where TSEX = ‘女’
union
select
sname name,
SSEX sex,
SBIRTHDAY birthday
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 A.*
FROM SCORE A
WHERE DEGREE < (SELECT AVG(DEGREE)
FROM SCORE B
WHERE A.CNO = B.CNO);

– 34、查询所有任课教师的Tname和Depart.
select
TNAME,
DEPART
from TEACHER a
where exists(select *
from COURSE b
where a.TNO = b.TNO);

– 35、查询所有未讲课的教师的Tname和Depart.
select
TNAME,
DEPART
from TEACHER a
where tno not in (select tno
from COURSE);

– 36、查询至少有2名男生的班号。
select CLASS
from STUDENT
where SSEX = ‘男’
group by CLASS
having count(SSEX) > 1;

– 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,
year(now()) - year(SBIRTHDAY)
from STUDENT;

– 39、查询Student表中最大和最小的Sbirthday日期值。
select min(SBIRTHDAY) birthday
from STUDENT
union
select max(SBIRTHDAY) birthday
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 *
from STUDENT
order by CLASS desc, year(now()) - year(SBIRTHDAY) desc;

– 41、查询“男”教师及其所上的课程。
select *
from TEACHER, COURSE
where TSEX = ‘男’ and COURSE.TNO = TEACHER.TNO;

– 42、查询最高分同学的Sno、Cno和Degree列。
select
sno,
CNO,
DEGREE
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, CLASS) = (select
SSEX,
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, STUDENT
where SCORE.SNO = STUDENT.SNO and SSEX = ‘男’ and CNO = (
select CNO
from COURSE
where CNAME = ‘计算机导论’);

– 46、使用游标方式来同时查询每位同学的名字，他所选课程及成绩。

declare
cursor student_cursor is
select S.SNO,S.SNAME,C.CNAME,SC.DEGREE as DEGREE
from STUDENT S, COURSE C, SCORE SC
where S.SNO=SC.SNO
and SC.CNO=C.CNO;

student_row student_cursor%ROWTYPE;

begin
open student_cursor;
loop
fetch student_cursor INTO student_row;
exit when student_cursor%NOTFOUND;
dbms_output.put_line( student_row.SNO || ‘’ ||

student_row.SNAME|| ‘’ || student_row.CNAME || ‘’ ||

student_row.DEGREE);
end loop;
close student_cursor;
END;
/

– 47、 声明触发器指令，每当有同学转换班级时执行触发器显示当前和之前所在班级。

CREATE OR REPLACE TRIGGER display_class_changes
AFTER DELETE OR INSERT OR UPDATE ON student
FOR EACH ROW
WHEN (NEW.sno > 0)

BEGIN

dbms_output.put_line('Old class: ’ || :OLD.class);
dbms_output.put_line('New class: ’ || :NEW.class);
END;
/

Update student
set class=95031
where sno=109;

– 48、 删除已设置的触发器指令

DROP TRIGGER display_class_changes;