sql复杂查询语句总结

转自：http://blog.csdn.net/fengfeng91/article/details/15029173

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);

1.  
   create table student(
2.  
   sno varchar2(10) primary key,
3.  
   sname varchar2(20),
4.  
   sage number(2),
5.  
   ssex varchar2(5)
6.  
   );
7.  
   create table teacher(
8.  
   tno varchar2(10) primary key,
9.  
   tname varchar2(20)
10.  
    );
11.  
    create table course(
12.  
    cno varchar2(10),
13.  
    cname varchar2(20),
14.  
    tno varchar2(20),
15.  
    constraint pk_course primary key (cno,tno)
16.  
    );
17.  
    create table sc(
18.  
    sno varchar2(10),
19.  
    cno varchar2(10),
20.  
    score number(4,2),
21.  
    constraint pk_sc primary key (sno,cno)
22.  
    );
23.  
    #/*******初始化学生表的数据******/
24.  
    insert into student values ('s001','张三',23,'男');
25.  
    insert into student values ('s002','李四',23,'男');
26.  
    insert into student values ('s003','吴鹏',25,'男');
27.  
    insert into student values ('s004','琴沁',20,'女');
28.  
    insert into student values ('s005','王丽',20,'女');
29.  
    insert into student values ('s006','李波',21,'男');
30.  
    insert into student values ('s007','刘玉',21,'男');
31.  
    insert into student values ('s008','萧蓉',21,'女');
32.  
    insert into student values ('s009','陈萧晓',23,'女');
33.  
    insert into student values ('s010','陈美',22,'女');
34.  
    commit;
35.  
    #/******************初始化教师表***********************/
36.  
    insert into teacher values ('t001', '刘阳');
37.  
    insert into teacher values ('t002', '谌燕');
38.  
    insert into teacher values ('t003', '胡明星');
39.  
    commit;
40.  
    #/***************初始化课程表****************************/
41.  
    insert into course values ('c001','J2SE','t002');
42.  
    insert into course values ('c002','Java Web','t002');
43.  
    insert into course values ('c003','SSH','t001');
44.  
    insert into course values ('c004','Oracle','t001');
45.  
    insert into course values ('c005','SQL SERVER 2005','t003');
46.  
    insert into course values ('c006','C#','t003');
47.  
    insert into course values ('c007','JavaScript','t002');
48.  
    insert into course values ('c008','DIV+CSS','t001');
49.  
    insert into course values ('c009','PHP','t003');
50.  
    insert into course values ('c010','EJB3.0','t002');
51.  
    commit;
52.  
    #/***************初始化成绩表***********************/
53.  
    insert into sc values ('s001','c001',78.9);
54.  
    insert into sc values ('s002','c001',80.9);
55.  
    insert into sc values ('s003','c001',81.9);
56.  
    insert into sc values ('s004','c001',60.9);
57.  
    insert into sc values ('s001','c002',82.9);
58.  
    insert into sc values ('s002','c002',72.9);
59.  
    insert into sc values ('s003','c002',81.9);
60.  
    insert into sc values ('s001','c003',59);

下面是一些擦寻要求及解答：

#注意：以下练习中的数据是根据初始化到数据库中的数据来写的SQL 语句，请大家务必注意。
#
#
#1、查询“c001”课程比“c002”课程成绩高的所有学生的学号；
select *  from sc a, sc b where a.sno=b.sno and a.cno='c001' and b.cno='c002' and a.score>b.score;
#2、查询平均成绩大于60 分的同学的学号和平均成绩；
select st.sname,ss.sco from student st,(select sno,avg(score)sco from sc group by sno)ss where st.sno=ss.sno and sco>=60;
#3、查询所有同学的学号、姓名、选课数、总成绩；
select st.sname,ss.* from student st,(select sno,count(score)sco,sum(score) from sc group by sno)ss where st.sno=ss.sno;
#4、查询姓“刘”的老师的个数；
select count(*) from teacher where tname like '%刘%';
#5、查询没学过“谌燕”老师课的同学的学号、姓名；
select sc.sno,acno.* from sc sc,(select co.cno from course co,(select tno from teacher where tname='谌燕')tn where co.tno<>tn.tno)acno where acno.cno=sc.cno;
#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 sa.sname,sc.sno from sc sc,(select st.sname,s.* from student st,(select sno,cno from sc where cno in('c001'))s where st.sno=s.sno)sa where sc.sno=sa.sno and sc.cno='c002';
#7、查询学过“谌燕”老师所教的所有课的同学的学号、姓名；
select distinct st.sname from student st,sc sc join (select cno from teacher te join course co on(te.tno=co.tno) where te.tname='谌燕')aca on(sc.cno=aca.cno) where st.sno=sc.sno;
#9、查询所有课程成绩小于60 分的同学的学号、姓名；
select st.sname,sc.sno from student st join sc sc on(st.sno=sc.sno)where sc.score<60;
#10、查询没有学全所有课的同学的学号、姓名；
select sname,st.sno,scn.cn from student st join (select distinct sno,count(*)cn from sc group by sc.sno)scn on(st.sno=scn.sno) where scn.cn=(select distinct count(cno) from course);
select st.sname,st.sno from student st join (select sc.sno sn,count(sc.cno) cou from sc group by sc.sno) scs on st.sno=scs.sn where scs.cou <(select count(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 distinct st.sno, sname
  from student st
  join sc sc on (st.sno = sc.sno)
 where sc.cno in (select cno from sc where sno = 's001') and sc.sno<>'s001';

1.  
   #注意：以下练习中的数据是根据初始化到数据库中的数据来写的SQL 语句，请大家务必注意。
2.  
   #
3.  
   #
4.  
   #1、查询“c001”课程比“c002”课程成绩高的所有学生的学号；
5.  
   select * from sc a, sc b where a.sno=b.sno and a.cno='c001' and b.cno='c002' and a.score>b.score;
6.  
   #2、查询平均成绩大于60 分的同学的学号和平均成绩；
7.  
   select st.sname,ss.sco from student st,(select sno,avg(score)sco from sc group by sno)ss where st.sno=ss.sno and sco>=60;
8.  
   #3、查询所有同学的学号、姓名、选课数、总成绩；
9.  
   select st.sname,ss.* from student st,(select sno,count(score)sco,sum(score) from sc group by sno)ss where st.sno=ss.sno;
10.  
    #4、查询姓“刘”的老师的个数；
11.  
    select count(*) from teacher where tname like '%刘%';
12.  
    #5、查询没学过“谌燕”老师课的同学的学号、姓名；
13.  
    select sc.sno,acno.* from sc sc,(select co.cno from course co,(select tno from teacher where tname='谌燕')tn where co.tno<>tn.tno)acno where acno.cno=sc.cno;
14.  
    #6、查询学过“c001”并且也学过编号“c002”课程的同学的学号、姓名；
15.  
    select sa.sname,sc.sno from sc sc,(select st.sname,s.* from student st,(select sno,cno from sc where cno in('c001'))s where st.sno=s.sno)sa where sc.sno=sa.sno and sc.cno='c002';
16.  
    #7、查询学过“谌燕”老师所教的所有课的同学的学号、姓名；
17.  
    select distinct st.sname from student st,sc sc join (select cno from teacher te join course co on(te.tno=co.tno) where te.tname='谌燕')aca on(sc.cno=aca.cno) where st.sno=sc.sno;
18.  
    #9、查询所有课程成绩小于60 分的同学的学号、姓名；
19.  
    select st.sname,sc.sno from student st join sc sc on(st.sno=sc.sno)where sc.score<60;
20.  
    #10、查询没有学全所有课的同学的学号、姓名；
21.  
    select sname,st.sno,scn.cn from student st join (select distinct sno,count(*)cn from sc group by sc.sno)scn on(st.sno=scn.sno) where scn.cn=(select distinct count(cno) from course);
22.  
    select st.sname,st.sno from student st join (select sc.sno sn,count(sc.cno) cou from sc group by sc.sno) scs on st.sno=scs.sn where scs.cou <(select count(cno) from course);
23.  
    #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；
24.  
    select distinct st.sno, sname
25.  
    from student st
26.  
    join sc sc on (st.sno = sc.sno)
27.  
    where sc.cno in (select cno from sc where sno = 's001') and sc.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；
#update sc sc set sc.score=update sc sc set sc.score=(select tc.cno,round(avg(sc.score),2)av from (select * from teacher te join course co on(te.tno=co.tno) where te.tname='谌燕')tc join sc sc on(tc.cno=sc.cno) group by tc.cno)cnn.score where sc.cno=cnn.av;
select tc.cno,round(avg(sc.score),2) from (select * from teacher te join course co on(te.tno=co.tno) where te.tname='谌燕')tc join sc sc on(tc.cno=sc.cno) group by tc.cno;
#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 cno 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 teacher te join course co on(te.tno=co.tno) where te.tname='谌燕')
#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 count(score) from sc where score>=60 group by cno ;
select cno,avg(score)acs,savg.cnu,(count(score)-savg.cnu)/count(score)*100 from sc,
(select count(score)cnu,avg(score)acs2 from sc where score<60 order by acs2 desc)savg
group by savg.cnu,cno order by acs desc;
#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 S.*,rownum rn from (select * from sc order by score desc)S where rownum<=3)where rn>=1;
#22、查询每门课程被选修的学生数
select cno,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 st.sname,st.sno from student st join
(select distinct sc.* from sc sc join (select sno,count(cno)cnum from sc group by sno)ss on(sc.sno=ss.sno) where ss.cnum=1)ssb
on(st.sno=ssb.sno);
#24、查询男生、女生人数
select ssex,count(ssex) from student st group by ssex;
#25、查询姓“张”的学生名单
select sname from student where sname like '%张%';
#26、查询同名同性学生名单，并统计同名人数
select st.* from student st join (select sname,count(sname)cnum from student group by sname)scomm on(st.sname=scomm.sname) where scomm.cnum>1;
#27、1981 年出生的学生名单(注：Student 表中Sage 列的类型是number)
select * from student 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 cno,avg(score)lim from sc group by cno order by lim asc;
#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
select st.sname,st.sno,savg.lim from student st join (select sno,avg(score)lim from sc group by sno)savg on(st.sno=savg.sno) where savg.lim>85;
#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 distinct st.sname,cs.score from student st join (select * from course co join sc sc on(co.cno=sc.cno))cs on(st.sno=cs.sno)where cs.score<60 and cs.cname='数据库';
#31、查询所有学生的选课情况；
select distinct st.sname,cs.cname from student st join (select * from course co join sc sc on(co.cno=sc.cno))cs on(st.sno=cs.sno);
#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 distinct st.sname,cs.score,cs.cname from student st join (select * from course co join sc sc on(co.cno=sc.cno))cs on(st.sno=cs.sno)where cs.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 sno 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 st.sname,st.sno from student st join (select * from sc where cno='c001' and score>80)snum on(st.sno=snum.sno);
#35、求选了课程的学生人数
select count(ss.sno) from (select distinct sno from sc)ss;
#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 st.sname,cnum.score from student st join
(select distinct * from sc sc where cno in(select distinct cno from course co join
(select tno from teacher where tname='谌燕')ten on(co.tno=ten.tno)) order by score desc)cnum on(st.sno=cnum.sno) where rownum=1;
#37、查询各个课程及相应的选修人数
#(select cno,count(cno) from sc group by cno);
select co.cname,cns.cnum from course co join (select cno,count(cno)cnum from sc group by cno)cns on(co.cno=cns.cno);
#39、查询每门功课成绩最好的前两名
select cno from sc order by score desc group by cno;
#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
select sno from (select sno,count(cno)cnum from sc group by sno) where cnum>=2;
#42、查询全部学生都选修的课程的课程号和课程名
#select count(*) from (select distinct sno from sc);
#select cno,count(cno)cns from sc group by cno;
#select cno from (select count(*)num from (select distinct sno from sc))cs1,(select cno,count(cno)cns from sc group by cno)cs2 where cs2.cns=cs1.num;
select cname,scs.cno from course co join
(select cno from (select count(*)num from (select distinct sno from sc))cs1,
(select cno,count(cno)cns from sc group by cno)cs2 where cs2.cns=cs1.num)scs on(co.cno=scs.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 co.cno from course co join (select tno from teacher where tname='谌燕')tn on(co.tno=tn.tno);
select sname from student where sno not in
(select distinct sno from sc where cno in(select co.cno from course co join
(select tno from teacher where tname='谌燕')tn on(co.tno=tn.tno)));
#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,count(sno),avg(score) from sc where score < 60 group by sno;
select * from (select sno,count(sno)cnum,avg(score) from sc where score < 60 group by sno)avs where avs.cnum>1;
#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<60 order by score desc;
#46、删除“s002”同学的“c001”课程的成绩
delete from sc where sno='s002' and cno='c001';

1.  
   #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；
2.  
   #update sc sc set sc.score=update sc sc set sc.score=(select tc.cno,round(avg(sc.score),2)av from (select * from teacher te join course co on(te.tno=co.tno) where te.tname='谌燕')tc join sc sc on(tc.cno=sc.cno) group by tc.cno)cnn.score where sc.cno=cnn.av;
3.  
   select tc.cno,round(avg(sc.score),2) from (select * from teacher te join course co on(te.tno=co.tno) where te.tname='谌燕')tc join sc sc on(tc.cno=sc.cno) group by tc.cno;
4.  
   #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；
5.  
   select cno from sc where sno='s001';
6.  
   #15、删除学习“谌燕”老师课的SC 表记录；
7.  
   delete from sc where sc.cno in(select cno from teacher te join course co on(te.tno=co.tno) where te.tname='谌燕')
8.  
   #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
9.  
   select cno,max(score),min(score) from sc group by cno;
10.  
    #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
11.  
    #select count(score) from sc where score>=60 group by cno ;
12.  
    select cno,avg(score)acs,savg.cnu,(count(score)-savg.cnu)/count(score)*100 from sc,
13.  
    (select count(score)cnu,avg(score)acs2 from sc where score<60 order by acs2 desc)savg
14.  
    group by savg.cnu,cno order by acs desc;
15.  
    #21、查询各科成绩前三名的记录:(不考虑成绩并列情况)
16.  
    select * from (select S.*,rownum rn from (select * from sc order by score desc)S where rownum<=3)where rn>=1;
17.  
    #22、查询每门课程被选修的学生数
18.  
    select cno,count(cno) from sc group by cno;
19.  
    #23、查询出只选修了一门课程的全部学生的学号和姓名
20.  
    select st.sname,st.sno from student st join
21.  
    (select distinct sc.* from sc sc join (select sno,count(cno)cnum from sc group by sno)ss on(sc.sno=ss.sno) where ss.cnum=1)ssb
22.  
    on(st.sno=ssb.sno);
23.  
    #24、查询男生、女生人数
24.  
    select ssex,count(ssex) from student st group by ssex;
25.  
    #25、查询姓“张”的学生名单
26.  
    select sname from student where sname like '%张%';
27.  
    #26、查询同名同性学生名单，并统计同名人数
28.  
    select st.* from student st join (select sname,count(sname)cnum from student group by sname)scomm on(st.sname=scomm.sname) where scomm.cnum>1;
29.  
    #27、1981 年出生的学生名单(注：Student 表中Sage 列的类型是number)
30.  
    select * from student where to_char(sysdate,'yyyy')-sage ='1981';
31.  
    #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
32.  
    select cno,avg(score)lim from sc group by cno order by lim asc;
33.  
    #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
34.  
    select st.sname,st.sno,savg.lim from student st join (select sno,avg(score)lim from sc group by sno)savg on(st.sno=savg.sno) where savg.lim>85;
35.  
    #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
36.  
    select distinct st.sname,cs.score from student st join (select * from course co join sc sc on(co.cno=sc.cno))cs on(st.sno=cs.sno)where cs.score<60 and cs.cname='数据库';
37.  
    #31、查询所有学生的选课情况；
38.  
    select distinct st.sname,cs.cname from student st join (select * from course co join sc sc on(co.cno=sc.cno))cs on(st.sno=cs.sno);
39.  
    #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；
40.  
    select distinct st.sname,cs.score,cs.cname from student st join (select * from course co join sc sc on(co.cno=sc.cno))cs on(st.sno=cs.sno)where cs.score>70;
41.  
    #33、查询不及格的课程，并按课程号从大到小排列
42.  
    select * from sc where score<60 order by sno desc;
43.  
    #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；
44.  
    select st.sname,st.sno from student st join (select * from sc where cno='c001' and score>80)snum on(st.sno=snum.sno);
45.  
    #35、求选了课程的学生人数
46.  
    select count(ss.sno) from (select distinct sno from sc)ss;
47.  
    #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
48.  
    select st.sname,cnum.score from student st join
49.  
    (select distinct * from sc sc where cno in(select distinct cno from course co join
50.  
    (select tno from teacher where tname='谌燕')ten on(co.tno=ten.tno)) order by score desc)cnum on(st.sno=cnum.sno) where rownum=1;
51.  
    #37、查询各个课程及相应的选修人数
52.  
    #(select cno,count(cno) from sc group by cno);
53.  
    select co.cname,cns.cnum from course co join (select cno,count(cno)cnum from sc group by cno)cns on(co.cno=cns.cno);
54.  
    #39、查询每门功课成绩最好的前两名
55.  
    select cno from sc order by score desc group by cno;
56.  
    #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
57.  
    #41、检索至少选修两门课程的学生学号
58.  
    select sno from (select sno,count(cno)cnum from sc group by sno) where cnum>=2;
59.  
    #42、查询全部学生都选修的课程的课程号和课程名
60.  
    #select count(*) from (select distinct sno from sc);
61.  
    #select cno,count(cno)cns from sc group by cno;
62.  
    #select cno from (select count(*)num from (select distinct sno from sc))cs1,(select cno,count(cno)cns from sc group by cno)cs2 where cs2.cns=cs1.num;
63.  
    select cname,scs.cno from course co join
64.  
    (select cno from (select count(*)num from (select distinct sno from sc))cs1,
65.  
    (select cno,count(cno)cns from sc group by cno)cs2 where cs2.cns=cs1.num)scs on(co.cno=scs.cno);
66.  
    #43、查询没学过“谌燕”老师讲授的任一门课程的学生姓名
67.  
    #select co.cno from course co join (select tno from teacher where tname='谌燕')tn on(co.tno=tn.tno);
68.  
    select sname from student where sno not in
69.  
    (select distinct sno from sc where cno in(select co.cno from course co join
70.  
    (select tno from teacher where tname='谌燕')tn on(co.tno=tn.tno)));
71.  
    #44、查询两门以上不及格课程的同学的学号及其平均成绩
72.  
    #select sno,count(sno),avg(score) from sc where score < 60 group by sno;
73.  
    select * from (select sno,count(sno)cnum,avg(score) from sc where score < 60 group by sno)avs where avs.cnum>1;
74.  
    #45、检索“c004”课程分数小于60，按分数降序排列的同学学号
75.  
    select sno from sc where cno='c004' and score<60 order by score desc;
76.  
    #46、删除“s002”同学的“c001”课程的成绩
77.  
    delete from sc where sno='s002' and cno='c001';