MySQL练习
https://www.cnblogs.com/qluzzh/p/10782993.html
https://blog.csdn.net/flycat296/article/details/63681089
建表语句：
1 use choujiang; 2 3 create table Student(Sid varchar(10),Sname Nvarchar(10),Sage datetime,Ssex Nvarchar(10)); 4 insert into Student values('01' , N'赵雷' , '1990-01-01' , N'男'); 5 insert into Student values('02' , N'钱电' , '1990-12-21' , N'男'); 6 insert into Student values('03' , N'孙风' , '1990-05-20' , N'男'); 7 insert into Student values('04' , N'李云' , '1990-08-06' , N'男'); 8 insert into Student values('05' , N'周梅' , '1991-12-01' , N'女'); 9 insert into Student values('06' , N'吴兰' , '1992-03-01' , N'女'); 10 insert into Student values('07' , N'郑竹' , '1989-07-01' , N'女'); 11 insert into Student values('08' , N'王菊' , '1990-01-20' , N'女'); 12 13 create table Course(Cid varchar(10),Cname Nvarchar(10),Tid varchar(10)); 14 insert into Course values('01' , N'语文' , '02'); 15 insert into Course values('02' , N'数学' , '01'); 16 insert into Course values('03' , N'英语' , '03'); 17 18 create table Teacher(Tid varchar(10),Tname Nvarchar(10)); 19 insert into Teacher values('01' , N'张三'); 20 insert into Teacher values('02' , N'李四'); 21 insert into Teacher values('03' , N'王五'); 22 23 create table SC(Sid varchar(10),Cid varchar(10),score decimal(18,1)); 24 insert into SC values('01' , '01' , 80); 25 insert into SC values('01' , '02' , 90); 26 insert into SC values('01' , '03' , 99); 27 insert into SC values('02' , '01' , 70); 28 insert into SC values('02' , '02' , 60); 29 insert into SC values('02' , '03' , 80); 30 insert into SC values('03' , '01' , 80); 31 insert into SC values('03' , '02' , 80); 32 insert into SC values('03' , '03' , 80); 33 insert into SC values('04' , '01' , 50); 34 insert into SC values('04' , '02' , 30); 35 insert into SC values('04' , '03' , 20); 36 insert into SC values('05' , '01' , 76); 37 insert into SC values('05' , '02' , 87); 38 insert into SC values('06' , '01' , 31); 39 insert into SC values('06' , '03' , 34); 40 insert into SC values('07' , '02' , 89); 41 insert into SC values('07' , '03' , 98);
