Oracle数据库的SQL操作脚本

 

   Oracle 数据SQL脚本学习

 

----- 建表语句 
create table student(
    sno varchar2(10) primary key,
    sname varchar2(20),
    sage number(2),
    ssex varchar2(5)
);
create table teacher(
    tno varchar2(10) primary key,
    tname varchar2(20)
);
create table course(
    cno varchar2(10),
    cname varchar2(20),
    tno varchar2(20),
    constraint pk_course primary key (cno,tno)
);
create table sc(
    sno varchar2(10),
    cno varchar2(10),
    score number(4,2),
    constraint pk_sc primary key (sno,cno)
);


/*******初始化学生表的数据******/
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');
commit;
/******************初始化教师表***********************/
insert into teacher values ('t001', '刘阳');
insert into teacher values ('t002', '谌燕');
insert into teacher values ('t003', '胡明星');
commit;
/***************初始化课程表****************************/
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');
commit;
/***************初始化成绩表***********************/
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 ('s003','c002',81.9);
insert into sc values ('s001','c003','59');
commit;

------------测试SQL语句 

----1、查询“c001”课程比“c002”课程成绩高的所有学生的学号；
select a.* from 
  (select * from sc a where a.cno='c001') a ,
  (select * from sc a where a.cno='c002') b 
where a.sno = b.sno and a.score > b.score;

select *  from sc a where a.cno = 'c001'
   and exists (select * from sc b
         where b.cno = 'c002'
           and a.score > b.score
           and a.sno = b.sno)
  
----2、查询平均成绩大于70 分的同学的学号和平均成绩；
select sno , avg(score) ag from sc  group by sno having avg(score)>70;

select * from (
  select sno , avg(score) ag from sc group by sno 
) where ag >70;

----3、查询所有同学的学号、姓名、选课数、总成绩；
select a.*,
       s.sname from  (select sno, count(cno), sum(score) from sc group by sno) a,
       student s where a.sno = s.sno;

select a.*, s.sname from student s join 
      (select sno, count(cno), sum(score) from sc group by sno) a
      on a.sno = s.sno ;
----4、查询姓“刘”的老师的个数；
select  count(*) from teacher t where tname like '刘%'

----5、查询没学过“谌燕”老师课的同学的学号、姓名；
select a.sno, a.sname from student a where a.sno not in
 (
  select distinct s.sno from sc s,  
      (select c.* from course c ,
         (select tno from teacher where tname='谌燕') t
       where c.tno = t.tno) b
  where s.cno = b.cno
  );

select * from student st where st.sno not in(
  select distinct s.sno from sc s 
        join course c  on s.cno = c.cno 
        join teacher t on t.tno = c.tno 
  where 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 s.* from sc a
      join sc b on a.sno = b.sno
      join student s on s.sno = a.sno 
     where a.cno = 'c001'
       and b.cno = 'c002'
       and s.sno = a.sno;
    
    select s.* from student s join 
    (
       select a.* from sc a join sc b on a.sno = b.sno 
       where a.cno = 'c001' and b.cno = 'c002'
    ) tt on s.sno = tt.sno 
    
----7、查询学过“谌燕”老师所教的所有课的同学的学号、姓名；
  select s.*, c.cno from student s 
    join sc a on s.sno = a.sno 
    join course c on c.cno = a.cno
    join teacher t on t.tno = c.tno  
 where 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 s.*, a.*, b.* from student s 
       join sc a on s.sno = a.sno 
       join sc b on s.sno = b.sno 
   where a.score > b.score  and  a.cno = 'c001' and  b.cno = 'c002';
   
   select * from student s 
       join sc a on s.sno = a.sno 
       join sc b on s.sno = b.sno 
   where a.score > b.score  and  a.cno = 'c001' and  b.cno = 'c002';
   
----9、查询所有课程成绩小于60 分的同学的学号、姓名；
  select * from student s 
       join sc a on s.sno = a.sno
       join course c on c.cno = a.cno 
       where a.score < 60 ;

----10、查询没有学全所有课的同学的学号、姓名；
   select s.sno, s.sname, count(a.cno) from student s
       left join sc a on s.sno = a.sno  
       group by s.sno, s.sname   
       having count(a.cno)<
         (select count (distinct cno ) from  course) ;

----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 st.* from student st,
      (select distinct a.sno from 
        (select * from sc) a,
        (select * from sc where sc.sno='s001') b
      where a.cno = b.cno)h 
      where st.sno = h.sno and st.sno <>'s001'   

----12、查询至少学过学号为“s001”同学所学课的其他同学学号和姓名、所学课；
    select * from sc
      left join student st on st.sno = sc.sno
     where sc.sno <> 's001'
       and sc.cno in (select cno from sc where sno = 's001')

----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；
    ---- 13.1 查询谌燕所授每门课的平均成绩
        select avg(a.score), c.cname from course c 
          join teacher tt on tt.tno = c.tno
          join sc a on a.cno = c.cno
          where tt.tname='谌燕'
          group by c.cno ,c.cname;
      
     ---- 13.2 查询谌燕所授全部课
          select cno from course a,teacher b
              where a.tno=b.tno and b.tname='谌燕'
     ---- 13.3 更改谌燕所授全部课的平均成绩
          update sc c set score = (select avg(c.score)
                            from course a, teacher b
                           where a.tno = b.tno
                             and b.tname = '谌燕'
                             and a.cno = c.cno
                           group by c.cno)
           where cno in (select cno
                           from course a, teacher b
                          where a.tno = b.tno
                            and b.tname = '谌燕')
     
----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；
     select  *  from sc where sno<>'s001'
      minus
      (
          select * from sc
              minus
          select * from sc where sno='s001'
      )

----15、删除学习“谌燕”老师课的SC 表记录；
      delete from sc where sc.cno in(     
          select cno from course a, teacher b
            where a.tno = b.tno
              and b.tname = '谌燕'
       );
       
      delete from sc where sc.cno in(  
          select cno from course c
             left join  teacher tt on c.tno = tt.tno
             where tt.tname='谌燕'
       ); 
       
----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；
insert into sc  (sno, cno, score)
  select distinct st.sno,
                  sc.cno,
                  (select avg(score) from sc where cno = 'c002')
    from student st, sc
   where not exists (select *
            from sc
           where cno = 'c002'
             and sc.sno = st.sno)
     and sc.cno = 'c002';
     
----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
   select cno, max(score), min(score) from sc group by cno;

----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
   select cno,
          avg(score),
          sum(case
                when score > 60 then
                 1
                else
                 0
              end) / count(*) as 及格率
     from sc
    group by cno
    order by avg(score), 及格率 desc ;

----19、查询不同老师所教不同课程平均分从高到低显示
      select max(t.tno),
             max(t.tname),
             max(c.cno),
             max(c.cname),
             c.cno,
             avg(score)
        from sc, course c, teacher t
       where sc.cno = c.cno
         and c.tno = t.tno
       group by c.cno
       order by avg(score) desc ;

    
----20、统计打印各科成绩,各分数段人数:课程ID,课程名称,[100-85],[85-70],[70-60],[ <60]
    select c.cno, c.cname ,
       sum(case when s.score between 85 and 100 then 1 else 0 end) as "[100-85]",
       sum(case when s.score between 70 and 85 then 1 else 0 end) as "[85-70]",
       sum(case when s.score between 60 and 70 then 1 else 0 end) as "[70-60]",
       sum(case when s.score < 60 then 1 else 0 end) as "[<60]"
    from sc s, course c where s.cno = c.cno group by  c.cno, c.cname ;
    
----21、查询各科成绩前三名的记录:(不考虑成绩并列情况)
    select * from (select sno, cno, score, 
                   row_number() over(partition by cno order by score desc) rn
              from sc)
     where rn < 4

----22、查询每门课程被选修的学生数
     select count(*), cno from sc group by cno;

----23、查询出只选修了一门课程的全部学生的学号和姓名
     select s.sno, s.sname, count(cno) from student s
        left join sc a on s.sno = a.sno 
        group by s.sno, s.sname having count(cno) = 1;

----24、查询男生、女生人数
     ---- 1
       select count(*), ssex from student where ssex='男'group by ssex
          union
       select count(*), ssex from student where ssex='女'group by ssex;
     ---- 2
       select count(*), ssex from student group by ssex;  
     
     
----25、查询姓“张”的学生名单
       select * from student where sname like '张%';

----26、查询同名同姓学生名单，并统计同名人数
       select sname, count(*) from student group by sname having count(*)>1;

----27、1981 年出生的学生名单(注：Student 表中Sage 列的类型是number)
       select sno,sname,sage,ssex from student t where to_char(sysdate,'yyyy')-sage =1981

----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
       select avg(a.score) ag, a.cno from sc a group by a.cno order by ag asc , a.cno desc;

----29、查询平均成绩大于70的所有学生的学号、姓名和平均成绩
       select s.sno, s.sname, avg(a.score) from student s 
              left join sc a on s.sno = a.sno group by s.sno, s.sname
              having  avg(a.score) > 70;

----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
       select s.sname, a.score from student s  
              join sc a on a.sno = s.sno
              join course c on c.cno = a.cno
            where c.cname = 'Oracle' and a.score < 60;
        
        select sname, score
          from student st, sc, course c
         where st.sno = sc.sno
           and sc.cno = c.cno
           and c.cname = 'Oracle'
           and sc.score < 60

----31、查询所有学生的选课情况；
      ----1   
      select s.sno, s.sname, a.cno, c.cname
          from student s , sc a, course c
          where s.sno = a.sno and a.cno = c.cno ; 
      ----2     
      select s.sno, s.sname, a.cno, c.cname from student s 
           left join sc a on a.sno = s.sno
           left join course c on a.cno = c.cno;
           
      ----3     
      select s.sno, s.sname, a.cno, 
           nvl(c.cname,'未选课') as name 
            from student s 
           left join sc a on a.sno = s.sno
           left join course c on a.cno = c.cno;             

----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；
      select * from student s, sc a, course c
          where s.sno = a.sno and a.cno = c.cno and a.score>70

----33、查询不及格的课程，并按课程号从大到小排列
      select * from sc where score < 60 order by score desc;
      
      select sc.sno, c.cname, sc.score from sc, course c
       where sc.cno = c.cno
         and sc.score < 60
       order by sc.cno desc;
       
----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；
      select * from student s 
         join sc a on s.sno = a.sno 
         where a.score > 80 and a.cno = 'c001';

----35、求选了课程的学生人数
      select count(distinct sno) from sc;        

----36、查询选修“谌燕”老师所授课程的学生中，成绩最高的学生姓名及其成绩
      select * from student s, sc , course c, teacher t
        where s.sno = sc.sno and sc.cno = c.cno and c.tno = t.tno
        and t.tname='谌燕' and sc.score = (
           select max(score) from sc where sc.cno=c.cno); 
           
----37、查询各个课程及相应的选修人数
      select cno,count(sno) from sc group by cno;

----38、查询不同课程成绩相同的学生的学号、课程号、学生成绩
      select a.* from sc a ,sc b where a.score=b.score and a.cno<>b.cno

----39、查询每门功课成绩最好的前两名
      select * from (
               select sno,cno,score, row_number() over (partition by cno order by score desc) my_rn from sc t
          )   where my_rn<=2

----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
        select cno, count(sno) from sc 
            group by cno 
              having count(sno) > 10
                 order by count(sno) desc, cno asc;

----41、检索至少选修两门课程的学生学号
        select sno from sc group by sno having count(cno)>1;
        select sno from sc group by sno having count(sno)>1;

----42、查询全部学生都选修的课程的课程号和课程名
        select distinct(c.cno),c.cname from course c ,sc where sc.cno=c.cno;
        
        select cno,cname from course c
              where c.cno in (select cno from sc group by cno);


----43、查询没学过“谌燕”老师讲授的任一门课程的学生姓名
       select st.sname
         from student st
        where st.sno not in (select distinct sc.sno
                               from sc, course c, teacher t
                              where sc.cno = c.cno
                                and c.tno = t.tno
                                and t.tname = '谌燕');


----44、查询两门以上不及格课程的同学的学号及其平均成绩
  select sno,avg(score)from sc
     where sno in (
       select sno from sc where sc.score < 60 group by sno having count(sno)>1
      ) group by sno ; 
      
      
----45、检索“c004”课程分数小于60，按分数降序排列的同学学号
     select sno from sc where cno='c004' and score<90 order by score desc;