我的私藏SQL练习题

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' , '1990-05-20' , '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('08' , '王菊' , '1990-01-20' , '女');insert into Student values('09' , '孙吴昊' , '1990-01-20' , '女');insert into Student values('10' , '赵雷' , '1990-01-20' , '女');create table Course(Cid varchar(10),Cname varchar(10),Tid varchar(10));insert into Course values('01' , '语文' , '02');insert into Course values('02' , '数学' , '01');insert into Course values('03' , '英语' , '03');insert into Course values('04' , '英语' , '01');create table Teacher(Tid varchar(10),Tname varchar(10));insert into Teacher values('01' , N'张三');insert into Teacher values('02' , N'李四');insert into Teacher values('03' , N'王五');insert into Teacher values('04' , N'汪二蛋');create table SC(Sid varchar(10),Cid varchar(10),score decimal(18,1));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);insert into SC values('08' , '03' , 98);insert into SC values('09' , '03' , 98);insert into SC values('10' , '04' , 59);