sql查询练习(一)

sql查询练习(一)

创建练习使用表

使用sql_test数据库

# create database sql_test;
use sql_test;

创建学生表

Student包含(Sid,Sname,Sage,Ssex四个字段)

create table Student(
  Sid varchar(10),
  Sname varchar(10),
  Sage datetime,
  Ssex varchar(10)
);

创建教师表

Teacher包含(Tid,Tname两个字段)

create table Teacher(
  Tid varchar(10),
  Tname varchar(10)
);

创建按课程表

Course包含(Cid,Cname,Tid三个字段)

create table Course(
  Cid varchar(10),
  Cname varchar(10),
  Tid varchar(10)
);

创建成绩表

SC包含(Sid,Cid,score三个字段)

create table SC(
  Sid varchar(10),
  Cid varchar(10),
  score decimal(18,1)
);

向表中插入数据

向学生表中插入数据

insert into Student values('01' , '赵雷' , '1900-01-01' , '男');
insert into Student values('02' , '钱电' , '1990-12-21' , '男');
insert into Student values('03' , '孙风' , '1990-05-20' , '男');
insert into Student values('04' , '李云' , '1990-08-06' , '男');
insert into Student values('05' , '周梅' , '1991-12-01' , '女');
insert into Student values('06' , '吴兰' , '1992-03-01' , '女');
insert into Student values('07' , '郑竹' , '1989-07-01' , '女');
insert into Student values('09' , '张三' , '2017-12-20' , '女');
insert into Student values('10' , '李四' , '2017-12-25' , '女');
insert into Student values('11' , '李四' , '2017-12-30' , '女');
insert into Student values('12' , '赵六' , '2017-01-01' , '女');
insert into Student values('13' , '孙七' , '2018-01-01' , '女');

向教师表中插入数据

insert into Teacher values ('01','张三');
insert into Teacher values ('02','李四');
insert into Teacher values ('03','王五');

向课程表中插入数据

insert into Course values('01' , '语文' , '02');
insert into Course values('02' , '数学' , '01');
insert into Course values('03' , '英语' , '03');

向成绩表中插入数据

insert into SC values('01' , '01' , 80);
insert into SC values('01' , '02' , 90);
insert into SC values('01' , '03' , 99);
insert into SC values('02' , '01' , 70);
insert into SC values('02' , '02' , 60);
insert into SC values('02' , '03' , 80);
insert into SC values('03' , '01' , 80);
insert into SC values('03' , '02' , 80);
insert into SC values('03' , '03' , 80);
insert into SC values('04' , '01' , 50);
insert into SC values('04' , '02' , 30);
insert into SC values('04' , '03' , 20);
insert into SC values('05' , '01' , 76);
insert into SC values('05' , '02' , 87);
insert into SC values('06' , '01' , 31);
insert into SC values('06' , '03' , 34);
insert into SC values('07' , '02' , 89);
insert into SC values('07' , '03' , 98);

验证

select * from Student;
select * from Teacher;
select * from Course;
select * from SC;
posted @   与时代共同进步  阅读(33)  评论(0编辑  收藏  举报
相关博文:
阅读排行:
· 一个费力不讨好的项目,让我损失了近一半的绩效!
· 清华大学推出第四讲使用 DeepSeek + DeepResearch 让科研像聊天一样简单!
· 实操Deepseek接入个人知识库
· CSnakes vs Python.NET:高效嵌入与灵活互通的跨语言方案对比
· Plotly.NET 一个为 .NET 打造的强大开源交互式图表库
点击右上角即可分享
微信分享提示