高级查询习题1-46

最新推荐文章于 2021-05-15 10:44:48 发布

lobo_seeworld

最新推荐文章于 2021-05-15 10:44:48 发布

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分类专栏： sql数据库文章标签：数据库

本文链接：https://blog.youkuaiyun.com/lobo_seeworld/article/details/78663877

创建数据库

create table student(
  sno varchar(10) primary key,
  sname varchar(20),
  sage numeric(2),
  ssex varchar(5)
);

DROP table student;
DROP TABLE teacher;
create table teacher(
 tno varchar(10) primary key,
 tname varchar(20)
);


create table course(
  cno varchar(10),
  cname varchar(20),
  tno varchar(20),
  constraint pk_course primary key (cno,tno)
);


create table sc(
   sno varchar(10),
   cno varchar(10),
   score  numeric(4,2),
   constraint pk_sc primary key (sno,cno)
);
DROP TABLE sc;



/*******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');



/******************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');


/***************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');

/***************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</