oracle面试题2

1、题目要求

为管理岗位业务培训信息，建立3个表:
S (S#,SN,SD,SA) S#,SN,SD,SA 分别代表学号、学员姓名、所属单位、学员年龄
C (C#,CN ) C#,CN 分别代表课程编号、课程名称
SC ( S#,C#,G ) S#,C#,G 分别代表学号、所选修的课程编号、学习成绩

• 1.查询选修课程名称为’数学’的学员学号和姓名
• 2.查询选修课程编号为’c002’的学员姓名和所属单位
• 3.查询不选修课程编号为’c001’的学员姓名和所属单位
• 4.查询选修全部课程的学员姓名和所属单位

2、建表语句

create table C
(
  c# ),
  cn )
)
;
comment on column C.c#
  is '课程编号';
comment on column C.cn
  is '课程名称';

create table S
(
  s# ),
  sd ),
  sn ),
  sa )
)
;
comment on column S.s#
  is '学号';
comment on column S.sd
  is '学员姓名';
comment on column S.sn
  is '所属单位';
comment on column S.sa
  is '学员年龄';

create table SC
(
  s# ),
  c# ),
  g  )
)
;
comment on column SC.s#
  is '学号';
comment on column SC.c#
  is '课程编号';
comment on column SC.g
  is '学习成绩';

insert into C (c#, cn)
values ('c001', '语文');
insert into C (c#, cn)
values ('c002', '数学');
insert into C (c#, cn)
values ('c003', '英语');
commit;

insert into S (s#, sd, sn, sa)
');
insert into S (s#, sd, sn, sa)
');
insert into S (s#, sd, sn, sa)
');
commit;

insert into SC (s#, c#, g)
');
insert into SC (s#, c#, g)
');
insert into SC (s#, c#, g)
');
insert into SC (s#, c#, g)
');
insert into SC (s#, c#, g)
');
insert into SC (s#, c#, g)
');
insert into SC (s#, c#, g)
');
insert into SC (s#, c#, g)
');
commit;

3、参考答案

--1.查询选修课程名称为’数学’的学员学号和姓名
select s.s#, s.sn
  from s, c, sc
 where s.s# = sc.s#
   and c.c# = sc.c#
   and c.cn = '数学'

--2.查询选修课程编号为’c002’的学员姓名和所属单位
select s.sn, s.sd
  from s, c, sc
 where s.s# = sc.s#
   and c.c# = sc.c#
   and c.c# = 'c002'
--3.查询不选修课程编号为’c001’的学员姓名和所属单位
select s.sn, s.sd
  from s
 where s.s# not in (select sc.s#
                      from sc, c
                     where sc.c# = c.c#
                       and c.c# = 'c001'
                       and s.s# = sc.s#)
--4.查询选修全部课程的学员姓名和所属单位
select s.sn, s.sd
  from s,
       (select sc.s#
          from sc
         group by sc.s#
        ) from C)) A
 where s.s# = A.s#