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;
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