--这些表有外键约束,必须先建立没有外键的表,先建一四或者先不管外键，建好表后添加外键
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CREATE TABLE STUDENT
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(SNO VARCHAR(3) NOT NULL,
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SNAME VARCHAR(4) NOT NULL,
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SSEX VARCHAR(2) NOT NULL,
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SBIRTHDAY DATE,
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SCLASS VARCHAR(5));
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CREATE TABLE TEACHER
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(TNO VARCHAR(3) NOT NULL,
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TNAME VARCHAR(4) NOT NULL, TSEX VARCHAR(2) NOT NULL,
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TBIRTHDAY DATETIME NOT NULL, PROF VARCHAR(6),
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DEPART VARCHAR(10) NOT NULL);
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CREATE TABLE COURSE
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(CNO VARCHAR(5) NOT NULL,
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CNAME VARCHAR(10) NOT NULL,
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TNO VARCHAR(10) NOT NULL);
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CREATE TABLE SCORE
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(SNO VARCHAR(3) NOT NULL,
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CNO VARCHAR(5) NOT NULL,
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DEGREE NUMERIC(10, 0) NOT NULL);
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ALTER TABLE student
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ADD CONSTRAINT primary key (sno);
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ALTER TABLE course
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ADD constraint primary key (cno);
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ALTER TABLE score
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ADD constraint primary key (sno, cno);
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ALTER TABLE teacher
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ADD constraint primary key (tno);
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ALTER TABLE course
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ADD constraint foreign key (tno) references teacher (tno);
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ALTER TABLE score
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ADD constraint foreign key (cno) references course (cno);
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INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,SCLASS) VALUES (108 ,'曾华'
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,'男' ,'1977-09-01',95033);
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INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,SCLASS) VALUES (105 ,'匡明'
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,'男' ,'1975-10-02',95031);
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INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,SCLASS) VALUES (107 ,'王丽'
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,'女' ,'1976-01-23',95033);
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INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,SCLASS) VALUES (101 ,'李军'
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,'男' ,'1976-02-20',95033);
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INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,SCLASS) VALUES (109 ,'王芳'
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,'女' ,'1975-02-10',95031);
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INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,SCLASS) VALUES (103 ,'陆君'
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,'男' ,'1974-06-03',95031);
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INSERT INTO TEACHER(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART)
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VALUES (804,'李诚','男','1958-12-02','副教授','计算机系');
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INSERT INTO TEACHER(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART)
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VALUES (856,'张旭','男','1969-03-12','讲师','电子工程系');
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INSERT INTO TEACHER(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART)
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VALUES (825,'王萍','女','1972-05-05','助教','计算机系');
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INSERT INTO TEACHER(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART)
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VALUES (831,'刘冰','女','1977-08-14','助教','电子工程系');
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INSERT INTO COURSE(CNO,CNAME,TNO) VALUES ('3-105','计算机导论',825);
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INSERT INTO COURSE(CNO,CNAME,TNO) VALUES ('3-245','操作系统',804);
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INSERT INTO COURSE(CNO,CNAME,TNO) VALUES ('6-166','数据电路',856);
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INSERT INTO COURSE(CNO,CNAME,TNO) VALUES ('9-888','高等数学',831);
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INSERT INTO SCORE(SNO,CNO,DEGREE) VALUES (103,'3-245',86);
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INSERT INTO SCORE(SNO,CNO,DEGREE) VALUES (105,'3-245',75);
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INSERT INTO SCORE(SNO,CNO,DEGREE) VALUES (109,'3-245',68);
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INSERT INTO SCORE(SNO,CNO,DEGREE) VALUES (103,'3-105',92);
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INSERT INTO SCORE(SNO,CNO,DEGREE) VALUES (105,'3-105',88);
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INSERT INTO SCORE(SNO,CNO,DEGREE) VALUES (109,'3-105',76);
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INSERT INTO SCORE(SNO,CNO,DEGREE) VALUES (101,'3-105',64);
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INSERT INTO SCORE(SNO,CNO,DEGREE) VALUES (107,'3-105',91);
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INSERT INTO SCORE(SNO,CNO,DEGREE) VALUES (108,'3-105',78);
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INSERT INTO SCORE(SNO,CNO,DEGREE) VALUES (101,'6-166',85);
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INSERT INTO SCORE(SNO,CNO,DEGREE) VALUES (107,'6-166',79);
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INSERT INTO SCORE(SNO,CNO,DEGREE) VALUES (108,'6-166',81);
-- 1、 查询Student表中的所有记录的Sname、Ssex和Class列。
-- SELECT s.sname,s.ssex,s.class from student s;
-- 2、 查询教师所有的单位即不重复的Depart列。
-- SELECT DISTINCT t.depart from teacher t;
-- 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 BETWEEN 60 and 80;
-- 5、 查询Score表中成绩为85，86或88的记录。
-- select * from score s where s.DEGREE in (85,86,88);
-- 6、 查询Student表中“95031”班或性别为“女”的同学记录。
-- SELECT * from student s where s.CLASS=95031 or s.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 sno,cno,degree from score order by cno asc,degree desc;
-- select * from score order by cno,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);
-- SELECT sno,cno from score order by degree desc limit 1;
-- 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),SNO from score where cno like '3%' GROUP BY cno HAVING count(cno) >= 5;
-- 13、查询最低分大于70，最高分小于90的Sno列。
-- SELECT sno,DEGREE from score GROUP BY sno HAVING min(degree)>70 and max(degree)<90;
-- SELECT * from score where sno in(105,108);
-- 14、查询所有学生的Sname、Cno和Degree列。
-- SELECT s.sname,c.cno,c.degree from student s left join score c on s.SNO=c.SNO;
-- 15、查询所有学生的Sno、Cname和Degree列。
-- select s.SNO,c.CNAME,s.DEGREE from score s join (course c) USING(cno);
-- 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;
-- SELECT s.SNAME,c.CNAME,sc.DEGREE from score sc join (course c,student s) USING(cno,sno);
-- 17、查询“95033”班所选课程的平均分。
-- select AVG(s.degree) from score s left join student t on s.SNO=t.SNO where t.CLASS='95033' GROUP BY s.CNO;
-- SELECT avg(s.DEGREE),st.SNAME from score s join student st USING(sno) where st.class='95033' GROUP BY s.CNO;
-- 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 s.sno,s.cno,g.rank from score s ,grade g where s.DEGREE BETWEEN g.low and g.upp;
-- SELECT s.sno,st.SNAME,s.CNO,c.CNAME,g.rank from score s join (grade g,student st,course c) USING(sno,CNO) where s.DEGREE BETWEEN g.low and g.upp ORDER BY g.rank;
-- 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 a.* from score a join score b where a.cno ='3-105' and a.DEGREE>b.DEGREE and b.SNO='109' and b.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 * from score where DEGREE <(SELECT MAX(DEGREE) FROM score) GROUP BY sno HAVING COUNT(SNO)>1 ORDER BY DEGREE;
-- 21、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=105)
-- 22、查询成绩高于学号为“109”、课程号为“3-105”的成绩的所有记录。
-- SELECT * from student s,score c where s.SNO=c.SNO and c.DEGREE >(SELECT DEGREE from score where cno='3-105' and sno='109');
-- 23、查询“张旭“教师任课的学生成绩。
-- select st.SNAME,s.DEGREE from score s,course c,teacher t,student st where t.TNAME='张旭' AND s.CNO=c.CNO and t.TNO=c.TNO and s.SNO=st.SNO;
-- 24、查询选修某课程的同学人数多于5人的教师姓名。
-- SELECT t.TNAME from teacher t join (course b,score c) on (t.TNO=b.TNO and b.CNO=c.CNO) GROUP BY c.CNO HAVING count(c.CNO)>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 DISTINCT CNO from score where DEGREE>='85';
-- 27、查询出“计算机系“教师所教课程的成绩表。
-- select t.TNAME,t.DEPART from teacher t where t.DEPART='计算机系';
-- SELECT degree from score where cno=(select cno from course where cname='计算机导论');
-- 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 a where PROF not in (SELECT PROF from teacher b where a.DEPART!=b.depart);
-- 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> 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 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 DISTINCT t.TNAME as name,t.TSEX as sex,t.TBIRTHDAY as birthday from teacher t UNION SELECT DISTINCT s.SNAME as name,s.SSEX as sex,s.SBIRTHDAY as birthday from student s;
-- 32、查询所有“女”教师和“女”同学的name、sex和birthday.
SELECT DISTINCT t.TNAME as name, t.TSEX as sex,t.TBIRTHDAY as birthday from teacher t where t.TSEX='女'
union
SELECT DISTINCT s.SNAME as name,s.SSEX as sex,s.SBIRTHDAY as birthday from student s where s.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 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 where Tname in (select distinct Tname from Teacher,Course,Score where Teacher.Tno=Course.Tno and Course.Cno=Score.Cno)
-- 35 查询所有未讲课的教师的Tname和Depart.
SELECT tname,depart from teacher where TNAME not in (select DISTINCT TNAME from teacher t,course c,score s where t.tno=c.tno AND c.cno=s.cno );
-- 36、查询至少有2名男生的班号。
-- SELECT a.class from student a where a.SSEX='男' GROUP BY class HAVING COUNT(a.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)) as age from student;
-- 39、查询Student表中最大和最小的Sbirthday日期值。
-- SELECT SNAME,sbirthday from student where SBIRTHDAY=(SELECT min(SBIRTHDAY) FROM student)
-- UNION
-- SELECT sname,sbirthday from student where SBIRTHDAY=(SELECT MAX(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,(YEAR(NOW())-YEAR(SBIRTHDAY)) as age FROM student ORDER BY class,age DESC;
-- 41、查询“男”教师及其所上的课程。
-- SELECT t.TNAME,c.CNAME from teacher t JOIN course c USING(TNO) where t.TSEX='男';
-- 42、查询最高分同学的Sno、Cno和Degree列。
-- SELECT a.* FROM score a where a.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 a.* from score a join (student b,course c) USING(sno,cno) where b.SSEX='男' AND c.CNAME='计算机导论';
数据库any和All区别：
any表示至少大于一个值，即大于最小值；
All表示大于每一个值，即大于最大值；
相同点：都是关键字，可用于多行子查询语句