（002）初级大数据开发_基础SQL(1题-10题)

一. 准备工作

--1.学生表Student(SId,Sname,Sage,Ssex)

--SId 学生编号,Sname 学生姓名,Sage 出生年月,Ssex 学生性别

--2.课程表Course(CId,Cname,TId)

--CId 课程编号,Cname 课程名称,TId 教师编号

--3.教师表Teacher(TId,Tname)

--TId 教师编号,Tname 教师姓名

--4.成绩表SC(SId,CId,score)

--SId 学生编号,CId 课程编号,score 分数

/*
 * 50道SQL练习题
 * author:Rabin
 * address:shanghai
 * current_date:2022-04-03
   环境:sqlserver
 * source：https://www.jianshu.com/p/476b52ee4f1b ,author：Kaidi_G
 */


--1.学生表Student(SId,Sname,Sage,Ssex)
--SId 学生编号,Sname 学生姓名,Sage 出生年月,Ssex 学生性别
create table Student(SId varchar(10),Sname varchar(10),Sage datetime,Ssex varchar(10));
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' , '1990-12-20' , '男');
insert into Student values('04' , '李云' , '1990-12-06' , '男');
insert into Student values('05' , '周梅' , '1991-12-01' , '女');
insert into Student values('06' , '吴兰' , '1992-01-01' , '女');
insert into Student values('07' , '郑竹' , '1989-01-01' , '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' , '2012-06-06' , '女');
insert into Student values('12' , '赵六' , '2013-06-13' , '女');
insert into Student values('13' , '孙七' , '2014-06-01' , '女');

--2.课程表Course(CId,Cname,TId)
--CId 课程编号,Cname 课程名称,TId 教师编号
create table Course(CId varchar(10),Cname nvarchar(10),TId varchar(10));
insert into Course values('01' , '语文' , '02');
insert into Course values('02' , '数学' , '01');
insert into Co