zoukankan      html  css  js  c++  java
  • Oracle数据库练习2

    表结构:

    drop table student;
    drop table course;
    drop table score;
    drop table teacher;
    
    CREATE TABLE STUDENT
    (SNO VARCHAR(30) NOT NULL, 
    SNAME VARCHAR(40) NOT NULL,
    SSEX VARCHAR(20) NOT NULL, 
    SBIRTHDAY DATE,
    CLASS NUMBER NOT NULL);
    
    CREATE TABLE COURSE
    (CNO VARCHAR(50) NOT NULL, 
    CNAME VARCHAR(100) NOT NULL, 
    TNO VARCHAR(100) NOT NULL);
    
    CREATE TABLE SCORE 
    (SNO VARCHAR(30) NOT NULL, 
    CNO VARCHAR(50) NOT NULL, 
    DEGREE NUMBER NOT NULL);
    
    CREATE TABLE TEACHER 
    (TNO VARCHAR(30) NOT NULL, 
    TNAME VARCHAR(40) NOT NULL, 
    TSEX VARCHAR(20) NOT NULL, 
    TBIRTHDAY DATE NOT NULL, 
    PROF VARCHAR(60), 
    DEPART VARCHAR(100) NOT NULL);

    插入数据:

    INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (108 ,'曾华' ,'' ,to_date('1977-09-01','yyyy-mm-dd'),95033);
    INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (105 ,'匡明' ,'' ,to_date('1975-10-02','yyyy-mm-dd'),95031);
    INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (107 ,'王丽' ,'' ,to_date('1976-01-23','yyyy-mm-dd'),95033);
    INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (101 ,'李军' ,'' ,to_date('1976-02-20','yyyy-mm-dd'),95033);
    INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (109 ,'王芳' ,'' ,to_date('1975-02-10','yyyy-mm-dd'),95031);
    INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (103 ,'陆君' ,'' ,to_date('1974-06-03','yyyy-mm-dd'),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 (108,'3-105',78);
    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,'6-166',81);
    
    INSERT INTO TEACHER(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) VALUES (804,'李诚','',to_date('1958-12-02','yyyy-mm-dd'),'副教授','计算机系');
    INSERT INTO TEACHER(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) VALUES (856,'张旭','',to_date('1969-03-12','yyyy-mm-dd'),'讲师','电子工程系');
    INSERT INTO TEACHER(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) VALUES (825,'王萍','',to_date('1972-05-05','yyyy-mm-dd'),'助教','计算机系');
    INSERT INTO TEACHER(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) VALUES (831,'刘冰','',to_date('1977-08-14','yyyy-mm-dd'),'助教','电子工程系');
    commit; 

    题目:

    --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 s.* FROM student s;
    --4、 查询Score表中成绩在60到80之间的所有记录。
    SELECT s.* FROM score s WHERE s.degree BETWEEN 60 AND 80;
    --5、 查询Score表中成绩为85,86或88的记录。,
    SELECT s.* 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 s.* FROM student s WHERE s.class='95031' OR s.ssex='';
    --7、 以Class降序查询Student表的所有记录。
    SELECT s.* FROM student s ORDER BY s.class DESC;
    --8、 以Cno升序、Degree降序查询Score表的所有记录。
    SELECT s.* FROM score s ORDER BY s.cno ASC ,s.degree DESC; 
    --9、 查询“95031”班的学生人数。
    SELECT COUNT(1) 学生人数 FROM student s WHERE s.class='95031'
    --10、查询Score表中的最高分的学生学号和课程号。
    SELECT s.sno,s.cno FROM score s WHERE s.degree=(SELECT MAX(s.degree) FROM score s);
    --11、查询‘3-105’号课程的平均分。
    SELECT AVG(s.degree) FROM score s WHERE s.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 s.cno,AVG(s.degree) FROM score s WHERE s.cno LIKE('3%') GROUP BY s.cno HAVING COUNT(1) >=5;
    --13、查询最低分大于70,最高分小于90的Sno列。
    SELECT s.sno FROM score s WHERE s.degree BETWEEN 70 AND 90;
    --14、查询所有学生的Sname、Cno和Degree列。
    SELECT st.sname,sc.cno,sc.degree FROM student st ,score sc WHERE st.sno=sc.sno;
    --15、查询所有学生的Sno、Cname和Degree列。
    SELECT sc.sno,c.cname,sc.degree FROM score sc,course c WHERE sc.cno=c.cno;
    --16、查询所有学生的Sname、Cname和Degree列。
    SELECT (SELECT st.sname FROM student st WHERE st.sno=sc.sno),c.cname,sc.degree FROM score sc,course c WHERE sc.cno=c.cno;
    --方法2
    SELECT st.sname,c.cname,sc.degree FROM student st,score sc,course c WHERE st.sno=sc.sno AND c.cno=sc.cno;
    --17、查询“95033”班所选课程的平均分。
    SELECT st.class,AVG(sc.degree) FROM student st,score sc WHERE st.sno=sc.sno AND st.class='95033' GROUP BY st.class
    --18、假设使用如下命令建立了一个grade表:
    create table grade
    (low number,
    upp number,
    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');
    commit;
    --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>=g.low AND s.degree<=g.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 st.* FROM student st,score sc WHERE st.sno=sc.sno AND sc.cno='3-105' 
    AND sc.degree>(SELECT sc.degree FROM score sc WHERE sc.sno='109' AND sc.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。(所有分数)
    SELECT s.* FROM score s WHERE s.degree NOT IN (SELECT MAX(s.degree) FROM score s GROUP BY s.cno) 
    AND s.sno IN (SELECT s.sno FROM score s GROUP BY s.sno HAVING COUNT(1)>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 score s WHERE s.degree>(SELECT s.degree FROM score s WHERE s.sno='109' AND s.cno='3-105') 
    --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 s.sno,s.sname,s.sbirthday FROM student s WHERE to_char(s.sbirthday,'yyyy')=
    (SELECT to_char(s.sbirthday,'yyyy') FROM student s WHERE s.sno='108')
    SELECT *  FROM student s1,student s2 WHERE TO_char
    --23、查询“张旭“教师任课的学生成绩。
    SELECT t.tname, s.degree FROM course c,score s,teacher t WHERE c.tno=t.tno AND c.cno=s.cno AND t.tname='张旭'
    --方法2
    SELECT sc.* FROM score sc WHERE sc.cno IN
    (SELECT c.cno FROM course c WHERE c.tno IN
    (SELECT t.tno FROM teacher t WHERE t.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 t.tname FROM course c,score s,teacher t WHERE c.tno=t.tno AND c.cno=s.cno GROUP BY t.tname HAVING COUNT(1)>5
    --方法2
    SELECT t.tname FROM teacher t WHERE t.tno IN
    (SELECT c.tno FROM course c WHERE c.cno IN
     (SELECT sc.cno FROM score sc GROUP BY sc.cno HAVING COUNT(1)>5))
    --25、查询95033班和95031班全体学生的记录。
    SELECT s.* FROM student s WHERE s.class='95033'OR s.class='95031'
    --26、查询存在有85分以上成绩的课程Cno.
    SELECT DISTINCT s.cno FROM score s WHERE s.degree>'85'
    --27、查询出“计算机系“教师所教课程的成绩表。
    SELECT s.degree FROM score s,course c,teacher t WHERE s.cno=c.cno AND c.tno=t.tno AND t.depart='计算机系'
    --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 t.tname,t.prof FROM teacher t WHERE t.depart='计算机系' 
    AND t.prof NOT IN(SELECT t.prof FROM teacher t WHERE t.depart='电子工程系')
    --29、查询选修编号为“3-105“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 s.cno,s.sno,s.degree FROM score s WHERE s.cno='3-105' AND 
    s.degree>ANY(SELECT s.degree FROM score s WHERE s.cno='3-245') ORDER BY s.degree DESC
    --30、查询选修编号为“3-105”且成绩高于选修编号为“3-245”的同学的Cno、Sno和Degree.
    SELECT s.cno,s.sno,s.degree FROM score s WHERE s.cno='3-105' AND 
    s.degree>ALL(SELECT s.degree FROM score s WHERE s.cno='3-245')
    --31、查询所有教师和同学的name、sex和birthday.
    SELECT tname,tsex,tbirthday FROM teacher UNION SELECT sname,ssex,sbirthday FROM student;
    --32、查询所有“女”教师和“女”同学的name、sex和birthday.
    SELECT tname,tsex,tbirthday FROM teacher  WHERE tsex='' 
    UNION SELECT sname,ssex,sbirthday  FROM student WHERE ssex='';
    --union:意思为联合,使用条件为两个表的列的类型和列数都要相同
    --union all 与union 的区别在于union all 包含了重复的数据
    --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 GROUP BY b.cno)
    --34、查询所有任课教师的Tname和Depart.
    SELECT t.tname,t.depart FROM teacher t WHERE EXISTS(SELECT 1 FROM course c WHERE c.tno=t.tno)
    --方法2
    SELECT t.tname,t.depart FROM teacher t WHERE t.tno IN(SELECT c.tno FROM course c);
    --35、查询所有未讲课的教师的Tname和Depart. 
    SELECT t.tname,t.depart FROM teacher t WHERE NOT EXISTS(SELECT 1 FROM course c WHERE c.tno=t.tno )
    --方法2
    SELECT t.tname,t.depart FROM teacher t WHERE t.tno NOT IN(SELECT c.tno FROM course c);
    --36、查询至少有2名男生的班号。
    SELECT r.class from (SELECT T.CLASS,SUM(DECODE(t.ssex,'',1,0)) m FROM STUDENT T GROUP BY T.CLASS) r WHERE r.m>=2
    --方法2
    SELECT S.CLASS FROM STUDENT S WHERE S.SSEX = '' GROUP BY S.CLASS HAVING COUNT(1) > 1
    --37、查询Student表中不姓“王”的同学记录。
    SELECT s.* FROM student s WHERE s.sname  NOT LIKE('王%')
    --38、查询Student表中每个学生的姓名和年龄。
    SELECT s.sname,to_char(SYSDATE,'yyyy')-to_char(s.sbirthday,'yyyy') 年龄 FROM student s 
    --39、查询Student表中最大和最小的Sbirthday日期值
    SELECT MAX(s.sbirthday),MIN(s.sbirthday) FROM student s
    --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 s.* FROM student s ORDER BY s.class,to_char(SYSDATE,'yyyymm')-to_char(s.sbirthday,'yyyymm') DESC
    --41、查询“男”教师及其所上的课程。
    SELECT c.cname FROM course c WHERE  c.tno inSelect t.tno from teacher t where t.tsex=''--方法2
    SELECT t.tname, c.cname FROM course c,teacher t WHERE c.tno= t.tno AND t.tsex=''
    --42、查询(每个课程里)最高分同学的Sno、Cno和Degree列。
    SELECT s.sno,s.cno,s.degree FROM score s WHERE s.degree IN (SELECT MAX(s.degree) FROM score s GROUP BY s.cno)
    --方法2
    SELECT s1.sno,s1.cno,s1.degree FROM score s1 WHERE s1.degree =
    (SELECT MAX(s2.degree) FROM score s2 WHERE s2.cno=s1.cno GROUP BY s2.cno)
    --43、查询和“李军”同性别的所有同学的Sname.
    SELECT s.sname FROM student s WHERE s.ssex IN (SELECT s.ssex FROM student s WHERE s.sname='李军')
    --44、查询和“李军”同性别并同班的同学Sname.
    SELECT s.sname FROM student s WHERE s.ssex IN (SELECT s.ssex FROM student s WHERE s.sname='李军')
    AND s.class IN (SELECT s.class FROM student s WHERE s.sname='李军')
    --方法2
    SELECT s.sname FROM student s WHERE (s.ssex,s.class) IN(SELECT s.ssex,s.class FROM student s WHERE s.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 sc.* FROM score sc WHERE sc.sno IN(SELECT st.sno FROM student st WHERE st.ssex='' ) 
     AND sc.cno IN(SELECT c.cno FROM course c WHERE c.cname='计算机导论' )
     --方法2
     SELECT sc.* FROM student st,score sc,course c WHERE st.sno=sc.sno AND sc.cno=c.cno AND st.ssex='' AND c.cname='计算机导论'
  • 相关阅读:
    确认端口占用
    [转]自建Syncthing中继服务器(私密传输或造福大众)
    【转】Syncthing – 数据同步利器---自己的网盘,详细安装配置指南,内网使用,发现服务器配置
    【转】搭建和配置Syncthing发现和中继服务器
    【转】Syncthing的安装与使用
    pycrypto安装出错的问题 intmax_t C:Program Files (x86)Windows Kits10include10.0.10240.0ucrtinttypes.
    Git从库中移除已删除大文件
    词云图
    [转].NET 性能测试工具 -- 事件跟踪器(ETW)
    [转]ANTS Performance Profiler和ANTS Memory Profiler 使用
  • 原文地址:https://www.cnblogs.com/wyc1991/p/9091713.html
Copyright © 2011-2022 走看看