**MYSQL*** **数据库和标的设计1**

MYSQL
数据库和标的设计1

#create table Grade(
id INT(11)PRIMARY KEY,
GreadeName VARCHAR(20),
Major VARCHAAR(50)
);

CREATE TABLE ClassInfo(
id INT(11),
ClassName VARCHAR(20),
GradeId INT(11),
BeginYear year,
PRIMARY KEY(id)
);
CREATE TABLE studentInfo (
name VARCHAR(20),
studentNo VARCHAR(18),
Gender VARCHAR(2),
age INT(4),
birthday DATE,
classID INT(4),
PRIMARY KEY(name,studentNo)
);