表的約束

MySQL數據庫表的設計 2015-09-28

表的約束主鍵約束create table student(id int primary key,name varchar(40));create table student(id int primary key auto_increment,name varchar(20)); 唯一約束create table student(id int primary key auto_increment,name varchar(20) unique); 非空約束create table student(
一周排行