精通nginx 精通学堂

CREATE TABLE students
 (sno VARCHAR2(30) NOT NULL,
 sname VARCHAR2(30) NOT NULL,
 ssex VARCHAR2(30) NOT NULL,
 sbirthday DATE,
 class VARCHAR2(30));
 select * from students
 CREATE TABLE courses
 (cno VARCHAR2(30) NOT NULL,
 cname VARCHAR2(30) NOT NULL,
 tno VARCHAR2(30) NOT NULL);
 select * from courses
 CREATE TABLE scores
 (sno VARCHAR2(30) NOT NULL,
 cno VARCHAR2(30) NOT NULL,
 degree number(10) NOT NULL);CREATE TABLE teachers
 (tno VARCHAR2(30) NOT NULL,
 tname VARCHAR2(30) NOT NULL, tsex VARCHAR2(30) NOT NULL,
 tbirthday DATE NOT NULL, prof VARCHAR2(30),
 depart VARCHAR2(30) NOT NULL);
 select * from teachers
 INSERT INTO students(SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (108 ,‘曾华’ ,‘男’ ,to_date(‘1977-09-01’, ‘yyyy-mm-dd’),95033);
 INSERT INTO students(SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (105 ,‘匡明’ ,‘男’ ,to_date(‘1975-10-02’, ‘yyyy-mm-dd’),95031);
 INSERT INTO students(SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (107 ,‘王丽’ ,‘女’ ,to_date(‘1976-01-23’, ‘yyyy-mm-dd’),95033);
 INSERT INTO students(SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (101 ,‘李军’ ,‘男’ ,to_date(‘1976-02-20’, ‘yyyy-mm-dd’),95033);
 INSERT INTO students(SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (109 ,‘王芳’ ,‘女’ ,to_date(‘1975-02-10’, ‘yyyy-mm-dd’),95031);
 INSERT INTO students(SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (103 ,‘陆君’ ,‘男’ ,to_date(‘1974-06-03’, ‘yyyy-mm-dd’),95031);INSERT INTO courses(CNO,CNAME,TNO)VALUES (‘3-105’ ,‘计算机导论’,825);
 INSERT INTO courses(CNO,CNAME,TNO)VALUES (‘3-245’ ,‘操作系统’ ,804);
 INSERT INTO courses(CNO,CNAME,TNO)VALUES (‘6-166’ ,‘数据电路’ ,856);
 INSERT INTO courses(CNO,CNAME,TNO)VALUES (‘9-888’ ,‘高等数学’ ,100);INSERT INTO scores (SNO,CNO,DEGREE)VALUES (103,‘3-245’,86);
 INSERT INTO scores (SNO,CNO,DEGREE)VALUES (105,‘3-245’,75);
 INSERT INTO scores (SNO,CNO,DEGREE)VALUES (109,‘3-245’,68);
 INSERT INTO scores (SNO,CNO,DEGREE)VALUES (103,‘3-105’,92);
 INSERT INTO scores (SNO,CNO,DEGREE)VALUES (105,‘3-105’,88);
 INSERT INTO scores (SNO,CNO,DEGREE)VALUES (109,‘3-105’,76);
 INSERT INTO scores (SNO,CNO,DEGREE)VALUES (101,‘3-105’,64);
 INSERT INTO scores (SNO,CNO,DEGREE)VALUES (107,‘3-105’,91);
 INSERT INTO scores (SNO,CNO,DEGREE)VALUES (108,‘3-105’,78);
 INSERT INTO scores (SNO,CNO,DEGREE)VALUES (101,‘6-166’,85);
 INSERT INTO scores (SNO,CNO,DEGREE)VALUES (107,‘6-106’,79);
 INSERT INTO scores (SNO,CNO,DEGREE)VALUES (108,‘6-166’,81);INSERT INTO teachers (TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) VALUES (804,‘李诚’,‘男’,to_date(‘1958-12-02’, ‘yyyy-mm-dd’),‘副教授’,‘计算机系’);
 INSERT INTO teachers (TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) VALUES (856,‘张旭’,‘男’,to_date(‘1969-03-12’, ‘yyyy-mm-dd’),‘讲师’,‘电子工程系’);
 INSERT INTO teachers (TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) VALUES (825,‘王萍’,‘女’,to_date(‘1972-05-05’, ‘yyyy-mm-dd’),‘助教’,‘计算机系’);
 INSERT INTO teachers (TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) VALUES (831,‘刘冰’,‘女’,to_date(‘1977-08-14’, ‘yyyy-mm-dd’),‘助教’,‘电子工程系’);select * from te
 1、 查询Students表中的所有记录的Sname、Ssex和Class列。
 select sname,ssex,class from students
 2、 查询教师所有的单位即不重复的Depart列。
 select distinct depart from teachers
 3、 查询Students表的所有记录。
 select * from students
 4、 查询Scores表中成绩在60到80之间的所有记录。
 select * from scores
 select degree from scores where degree between 60 and 80;
 5、 查询Scores表中成绩为85，86或88的记录。
 select degree from scores where degree = 85 or degree = 86 or degree = 88;
 6、 查询Students表中“95031”班或性别为“女”的同学记录。
 select * from students
 select class,ssex from students where class = ‘95031’ or ssex =‘女’;
 7、 以Class降序查询Students表的所有记录。
 select class from students order by class desc;
 8、 以Cno升序、Degree降序查询Scores表的所有记录。
 select * from scores
 select cno,degree from scores order by cno desc,cno asc;
 9、 查询“95031”班的学生人数。
 select * from students
 select count(*) from students where class =‘95031’;
 10、查询Scores表中的最高分的学生学号和课程号。–bu
 select sname from students 学号
 (select max(degree) from scores)
 join scores 学浩 on 学号 sno = 学浩 sno
 ;
 11、查询‘3-105’号课程的平均分。
 select avg(degree) from scores 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。13、查询最低分大于70，最高分小于90的Sno列。
 select sno from scores where degree between 70 and 90;
 14、查询所有学生的Sname、Cno和Degree列。
 select sname,b.cno,degree from students a join scores b on a.sno = b.sno;15、查询所有学生的Sno、Cname和Degree列。
 select * from courses
 select * from students
 select * from scoresselect Sno,cname,Degree from scores a join courses b on a.cno = b.cno
16、查询所有学生的Sname、Cname和Degree列。
select sname,cname,degree from scores a, courses b, students c where a.cno = b.cno and c.sno = a.sno;
select sname,cname,degree from students t join scores s on t.sno = s.sno join courses c on s.cno = c.cno;
17、查询“95033”班所选课程的平均分。
select avg(degree) from scores where degree in
 (select degree from students a, scores c where a.sno =c.sno and class = 95033);18、假设使用如下命令建立了一个grade表：
 create table grade(low number(10),upp number(10),rank varchar2(10));
 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’);
 select * from grade
 现查询所有同学的Sno、Cno和rank列。
 select * from grade
 select * from scores
 select * from students
 select sno,cno,rank from scores a join grade b on degree between low and upp;
 select sno,cno,rank from scores a,grade b where degree between low and upp;
 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 scores where degree >all (select degree from scores where sno=109) and cno = ‘3-105’
select * from scores where degree >
 (select degree from scores where cno ='3-105’and sno = 109) and 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 scores a join students b on a.sno = b.sno)
 select * from studentsselect * from scores where degree not in(
 select max(degree) from scores group by sno having count(sno) >1);select degree from scores where degree not in
 (select max(degree) from scores group by sno having count (sno) >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。
 select * from scores where degree >all
 (select degree from scores where cno = ‘3-105’ and sno = 109) and cno = ‘3-105’;22、查询“张旭“教师任课的学生成绩。
 select * from teachers
 select * from students
 select * from scores
 select * from courses
 select * from scores a where a.cno in(
 select cno from courses where tno in(
 select tno from teachers where tname = ‘张旭’));23、查询选修某课程的同学人数多于5人的教师姓名。
select tname from teachers t join courses c on t.tno = c.tno where cno =
 (select cno from scores group by cno having count(cno)>5)24、查询95033班和95031班全体学生的记录。
 select * from students
 select class
 select * from students where class =any
 (select * from students where class in (95033 ,95031) );
 25、查询存在有85分以上成绩的课程Cno.
 select distinct cno from scores where degree > 85
 26、查询出“计算机系“教师所教课程的成绩表。
 select * from scores where cno in(
 select cno from courses where tno in
 (select tno from teachers where depart = ‘计算机系’));
 select * from scores where cno in
 (select cno from teachers a,courses b where a.tno = b.tno and depart = ‘计算机系’);
 27、查询“计算机系”与“电子工程系“不同职称的教师的Tname和Prof。select * from teachers where prof in
 (select prof from teachers group by prof having count(prof)=1)and depart in( ‘计算机系’ ,‘电子工程系’);28、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 courses where cno = ‘3-105’;
 select * from scores where degree > any
 (select degree from scores where cno = ‘3-105’)and cno =‘3-245’ order by degree desc;29、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 courses where cno = ‘3-105’
 select * from scores where degree >all
 (select degree from scores where cno = ‘3-245’)and cno =‘3-105’;30、查询所有教师和同学的name、sex和birthday.
 select tname,tsex,tbirthday from teachers
 union
 select sname,ssex,sbirthday from students31、查询所有“女”教师和“女”同学的name、sex和birthday.
 select tname,tsex,tbirthday from teachers where tsex = ‘女’
 union
 select sname,ssex,sbirthday from students where ssex = ‘女’;
 32、查询成绩比该课程平均成绩低的同学的成绩表。
 select * from scores where
 (select avg(degree) from scores );select * from scores c where degree < (
 select avg(degree) from scores e group by cno having e.cno = c.cno);select * from scores;
 33、查询所有任课教师的Tname和Depart.
 34 查询所有未讲课的教师的Tname和Depart.
 35、查询至少有2名男生的班号。
 select distinct class frjava sources om students where class in
 (select class from students group by class having count (ssex)>1 ) and ssex=‘男’ ;
 36、查询Student表中不姓“王”的同学记录。
 select sname from students where sname not like ‘王%’;
 37、查询Student表中最大和最小的Sbirthday日期值。
 38、以班号和年龄从大到小的顺序查询Student表中的全部记录。
 39、查询“男”教师及其所上的课程。
 40、查询最高分同学的Sno、Cno和Degree列。
 select sno,cno,degree from scores where degree in
 (select max(degree) from scores);
 41、查询和“李军”同性别的所有同学的Sname.
 42、查询和“李军”同性别并同班的同学Sname.
 select sname from students where ssex in
 (select ssex from students where sname = ‘李军’)
 and class in
 (select class from students where sname = ‘李军’)
 and sname != ‘李军’;select * from students where class in(
 select class from students where ssex =
 (select ssex from students where sname = ‘李军’ ))and sname = ‘李军’;
 43、查询所有选修“计算机导论”课程的“男”同学的成绩表select ssex, o.cno,o.sno,degree from
 students s ,scores o,courses c where s.sno = o.sno
 and o.cno = c.cno and cname = ‘计算机导论’ and ssex = ‘男’;