设有一数据库，包括四个表：学生表（Student）课程表（Course）成绩表（Score）以及教师信息表（Teacher）。四个表的结构分别如表1-1的表~表所示，数据如表1-2的表

Posted 2020-07-23 凌零聆

表（一）Student (学生表) 

-- Create table
create table STUDENT
(
  sno       VARCHAR2(3) not null,
  sname     VARCHAR2(8) not null,
  ssex      VARCHAR2(2) not null,
  sbirthday DATE,
  class     VARCHAR2(5)
)
tablespace USERS
  pctfree 10
  initrans 1
  maxtrans 255;
-- Add comments to the table 
comment on table STUDENT
  is \'学生表\';
-- Add comments to the columns 
comment on column STUDENT.sno
  is \'学号（主键）\';
comment on column STUDENT.sname
  is \'学生姓名\';
comment on column STUDENT.ssex
  is \'学生性别\';
comment on column STUDENT.sbirthday
  is \'学生出生年月\';
comment on column STUDENT.class
  is \'学生所在班级\';

表（一）Student中的数据

表（二）Course（课程表）

-- Create table
create table COURSE
(
  cno   VARCHAR2(5) not null,
  cname VARCHAR2(10) not null,
  tno   VARCHAR2(3) not null
)
tablespace USERS
  pctfree 10
  initrans 1
  maxtrans 255;
-- Add comments to the table 
comment on table COURSE
  is \'课程表\';
-- Add comments to the columns 
comment on column COURSE.cno
  is \'课程号（主键）\';
comment on column COURSE.cname
  is \'课程名称\';
comment on column COURSE.tno
  is \'教工编号（外键）\';

表（二）Course（课程表）中的数据

表（三）Score(成绩表)

 

-- Create table
create table SCORE
(
  sno    VARCHAR2(3) not null,
  cno    VARCHAR2(5) not null,
  degree NUMBER(4,1)
)
tablespace USERS
  pctfree 10
  initrans 1
  maxtrans 255;
-- Add comments to the table 
comment on table SCORE
  is \'成绩表\';
-- Add comments to the columns 
comment on column SCORE.sno
  is \'学号（外键）\';
comment on column SCORE.cno
  is \'课程号（外键）\';
comment on column SCORE.degree
  is \'成绩\';

表（三）Score(成绩表)中的数据

表（四）Teacher(教师表)

 

-- Create table
create table TEACHER
(
  tno       VARCHAR2(3) not null,
  tname     VARCHAR2(4) not null,
  tsex      VARCHAR2(2) not null,
  tbirthday DATE,
  prof      VARCHAR2(6),
  depart    VARCHAR2(10) not null
)
tablespace USERS
  pctfree 10
  initrans 1
  maxtrans 255;
-- Add comments to the table 
comment on table TEACHER
  is \'教师表\';
-- Add comments to the columns 
comment on column TEACHER.tno
  is \'教工编号（主键）\';
comment on column TEACHER.tname
  is \'教工姓名\';
comment on column TEACHER.tsex
  is \'教工性别\';
comment on column TEACHER.tbirthday
  is \'教工出生年月\';
comment on column TEACHER.prof
  is \'职称\';
comment on column TEACHER.depart
  is \'教工所在部门\';

表（四）Teacher(教师表)中的数据