oracle数据库经典练习题及答案

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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 */

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