oracle数据库经典练习题及答案

心已赠人 2022-08-06 06:11 149阅读 0赞

最近下载了一套oracle数据库习题（无答案），本人自己在oracle上练习得到的答案，如果不对的地方，请不要见怪。保存到博客方便自己以后查阅。

相关数据：

/*初始化学生表  student*/
    insert into student values ('s001','张三',23,'男');
    insert into student values ('s002','李四',23,'男');
    insert into student values ('s003','吴鹏',25,'男');
    insert into student values ('s004','琴沁',20,'女');
    insert into student values ('s005','王丽',20,'女');
    insert into student values ('s006','李波',21,'男');
    insert into student values ('s007','刘玉',21,'男');
    insert into student values ('s008','萧蓉',21,'女');
    insert into student values ('s009','陈萧晓',23,'女');
    insert into student values ('s010','陈美',22,'女');
    
    /*初始化教师表  teacher */
    insert into teacher values ('t001','刘阳');
    insert into teacher values ('t002','谌燕');
    insert into teacher values ('t003','胡明星');
    
    
    /*初始化课程表  course*/
    insert into course values ('c001','J2SE','t002'); 
    insert into course values ('c002','Java Web','t002');
    insert into course values ('c003','SSH','t001');
    insert into course values ('c004','Oracle','t001');
    insert into course values ('c005','SQL SERVER 2005','t003');
    insert into course values ('c006','C#','t003');
    insert into course values ('c007','JavaScript','t002');
    insert into course values ('c008','DIV+CSS','t001');
    insert into course values ('c009','PHP','t003');
    insert into course values ('c010','EJB3.0','t002');
    
    
    /*初始化成绩表  sc*/
    insert into sc values ('s001','c001',78.9);
    insert into sc values ('s002','c001',80.9);
    insert into sc values ('s003','c001',81.9);
    insert into sc values ('s004','c001',60.9);
    insert into sc values ('s001','c002',82.9);
    insert into sc values ('s002','c002',72.9); 
    
    insert into sc values ('s005','c003',78.9);
    insert into sc values ('s006','c004',50.9);
    insert into sc values ('s007','c005',81.9);
    insert into sc values ('s008','c006',50.9);
    insert into sc values ('s005','c007',42.9);
    insert into sc values ('s006','c008',72.9); 
    insert into sc values ('s005','c009',52.9);
    insert into sc values ('s006','c010',92.9);

练习题：

/*1、查询“c001”课程比“c002”课程成绩高的所有学生的学号；*/ 
    select distinct c.sno
      from sc c
     where (select a.score
              from sc a
             where a.sno = c.sno
               and a.cno = 'c001') >
           (select a.score
              from sc a
             where a.sno = c.sno
               and a.cno = 'c002')
    
      
    /* 2、查询平均成绩大于60分的同学的学号和平均成绩；*/  
    select *
      from (select a.sno, avg(score) avgScore from sc a group by a.sno)
     where avgScore > 60
     
     
    /*3、查询所有同学的学号、姓名、选课数、总成绩； */ 
    select c.sno, c.sname, nvl(d.coursenum, 0), nvl(d.totalscore, 0)
      from student c
      left join (select a.sno,
                        a.sname,
                        count(b.sno) coursenum,
                        sum(b.score) totalscore
                   from student a, sc b
                  where a.sno = b.sno
                  group by a.sno, a.sname) d
        on c.sno = d.sno
      
     
    /* 4、查询姓“刘”的老师的个数； */ 
    select count(*) from teacher a 
    where a.tname like '刘%'
     
    /* 5、查询没学过“谌燕”老师课的同学的学号、姓名； */ 
    select b.sno, e.sname
      from sc b
      left join student e
        on b.sno = e.sno
     where b.score < 60
       and b.cno in
           (select c.cno
              from course c
             where c.tno = (select d.tno from teacher d where d.tname = '谌燕'))
     
     
    /*6、查询学过“c001”并且也学过编号“c002”课程的同学的学号、姓名；*/  
    select c.sno, d.sname
      from (select b.sno sno, count(*) numCount
              from sc b
             where b.cno in ('c001', 'c002')
             group by sno) c
      left join student d
        on c.sno = d.sno
     where c.numCount = 2
    
    
       
    /*7、查询学过“谌燕”老师所教的所有课的同学的学号、姓名；*/  
    select a.sno, a.sname
      from student a
     where a.sno in (select d.sno
                       from sc d
                      where d.cno in (select c.cno
                                        from teacher b, course c
                                       where b.tno = c.tno
                                         and b.tname = '谌燕'));
    
      
    /*8、查询课程编号“c002”的成绩比课程编号“c001”课程低的所有同学的学号、姓名；*/  
    
    select a.sno, a.sname
      from student a
     where a.sno in (select b.sno
                       from sc b, sc c
                      where b.cno = 'c001'
                        and c.cno = 'c002'
                        and b.sno = c.sno
                        and b.score > c.score);
       
    /*9、查询所有课程成绩小于60分的同学的学号、姓名； */     
    
    select a.sno, a.sname
      from student a
     where a.sno in (select b.sno from sc b where b.score < 60);
    
    
    /*10、查询没有学全所有课的同学的学号、姓名； */ 
      
    select a.sno, a.sname
      from student a
     where a.sno in
           (select c.sno
              from (select b.sno, count(b.cno) cno_num
                      from student a, sc b
                     where a.sno = b.sno
                     group by b.sno) c
             where c.cno_num < (select count(d.cno) from course d))
        or a.sno not in (select distinct e.sno from sc e);
    
    /*11、查询至少有一门课与学号为“s001”的同学所学相同的同学的学号和姓名；*/  
    select * from student;
    select * from teacher;
    select * from course;
    select * from  sc;    
    /*12、查询至少学过学号为“s001”同学所有一门课的其他同学学号和姓名；   
    13、把“SC”表中“谌燕”老师教的课的成绩都更改为此课程的平均成绩；  
    14、查询和“s001”号的同学学习的课程完全相同的其他同学学号和姓名；
    15、删除学习“谌燕”老师课的SC表记录；      
    16、向SC表中插入一些记录，这些记录要求符合以下条件：没有上过编号“c002”课程的同学学号、“c002”      号课的平均成绩；      
    17、查询各科成绩最高和最低的分：以如下形式显示：课程ID，最高分，最低分    
    18、按各科平均成绩从低到高和及格率的百分数从高到低顺序     
    19、查询不同老师所教不同课程平均分从高到低显示   
    20、统计列印各科成绩,各分数段人数:课程ID,课程名称,[100-85],[85-70],[70-60],[ <60]   
    21、查询各科成绩前三名的记录:(不考虑成绩并列情况)     
    22、查询每门课程被选修的学生数   
    23、查询出只选修了一门课程的全部学生的学号和姓名   
    24、查询男生、女生人数   
    25、查询姓“张”的学生名单    
    26、查询同名同性学生名单，并统计同名人数   
    27、1981年出生的学生名单(注：Student表中Sage列的类型是number)    
    28、查询每门课程的平均成绩，结果按平均成绩升序排列，平均成绩相同时，按课程号降序排列    
    29、查询平均成绩大于85的所有学生的学号、姓名和平均成绩   
    30、查询课程名称为“数据库”，且分数低于60的学生姓名和分数   
    31、查询所有学生的选课情况；   
    32、查询任何一门课程成绩在70分以上的姓名、课程名称和分数；   
    33、查询不及格的课程，并按课程号从大到小排列   
    34、查询课程编号为c001且课程成绩在80分以上的学生的学号和姓名；   
    35、求选了课程的学生人数 
    37、查询各个课程及相应的选修人数   
    38、查询不同课程成绩相同的学生的学号、课程号、学生成绩   
    39、查询每门功成绩最好的前两名   
    40、统计每门课程的学生选修人数（超过10人的课程才统计）。要求输出课程号和选修人数，查询结果按人数降序排列，若人数相同，按课程号升序排列    
    41、检索至少选修两门课程的学生学号   
    42、查询全部学生都选修的课程的课程号和课程名   
    43、查询没学过“谌燕”老师讲授的任一门课程的学生姓名   
    44、查询两门以上不及格课程的同学的学号及其平均成绩   
    45、检索“c004”课程分数小于60，按分数降序排列的同学学号   
    46、删除“s002”同学的“c001”课程的成绩 */