数据分析 | MySQL45道练习题（1~9）

数据准备

创建学生表(Student)、教师表(Teacher)、科目表(Course)、成绩表(SC)

# 学生表 Student：
 
create table Student(
 
SId varchar(10) ,
 
Sname varchar(10),
 
Sage datetime,
 
Ssex varchar(10));
 
 
# 教师表 Teacher
 
create table Teacher(
 
TId varchar(10),
 
Tname varchar(10)); 
 
 
# 科目表 Course
 
create table Course(
 
CId varchar(10),
 
Cname nvarchar(10),
 
TId varchar(10)); 

 
# 成绩表 SC
 
create table SC(
 
SId varchar(10),
 
CId varchar(10),
 
score decimal(18,1)); 

插入数据

# 学生表 Student：
 
insert into Student values('01' , '赵雷' , '1990-01-01' , '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');
 
 
# 科目表 Course
 
insert into Course values('01' , '语文' , '02'); 
 
insert into Course values('02' , '数学' , '01'); 
 
insert into Course values('03' , '英语' , '03'); 
 
 
# 教师表 Teacher
 
insert into Teacher values('01' , '张三');
  
insert into Teacher values('02' , '李四'); 
 
insert into Teacher values('03' , '王五