mysql创建表

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说明:此文件包含了blog数据库中建立所有的表的Mysql语句.   在sql语句中注意“约束的概念": 1.实体完整性约束(主键--唯一且非空) primary key()     违约处理:No action(拒绝执行)   2.参照完整性约束(外键约束)foregin key() references tableName(filedName) [on delete|update casecade | no action]   违约处理:级联更新或拒绝执行   3.用户自定义完整性约束(not null,unique,check短语)       违约处理:拒绝执行   //添加列语法 //【alter table blog_article add columName type constraint】 //添加约束例子 //【alter table blog_article add CONSTRAINT foreign key(category_Name) references blog_category(category_Name) on delete cascade on update cascade】     问题:如何让相册，相片，文章公用一个评论表?   create database blog;   create table blog_user (   user_Name char(15) not null check(user_Name !=''),   user_Password char(15) not null,   user_emial varchar(20) not null unique,   primary key(user_Name)            )engine=innodb default charset=utf8 auto_increment=1;         create table blog_category (  category_Name char(18) not null check(category_Name!=''),  category_Date datetime not null,  primary key(category_Name) )engine=innod default charset=utf8 auto_increment=1;         create table blog_article (   article_Id int unsigned not null  auto_increment,   article_title varchar(20) not null unique,   article_content longtext not null,   article_date datetime not null,   article_readTime int unsigned not null default 0,   user_Name char(15) not null,   category_Name char(18) not null,   primary key(article_Id),   foreign key(user_Name) references blog_user(user_Name) on delete cascade on update cascade,   foreign key(category_Name) references blog_category(category_Name) on delete cascade on update cascade )engine=innodb default charset=utf8 auto_increment=1;             CREATE TABLE blog_comment (   comment_Id int(10) unsigned NOT NULL AUTO_INCREMENT,   comment_Content varchar(90) NOT NULL,   comment_Date datetime NOT NULL,   article_Id int(10) unsigned NOT NULL,   user_Name char(15) NOT NULL,   PRIMARY KEY (comment_Id),   foreign key(article_Id) references blog_article(article_Id) on delete cascade on update cascade,   foreign key(user_Name) references blog_user(user_Name) on delete cascade on update cascade )engine=innodb default charset=utf8 auto_increment=1;       create table blog_photoAlbum (   photoAlbum_Name char(20) not null check(photoAlbum_Name!=''),   photoAlbum_Date datetime not null,   primary key(photoAlbum_Name) )engine=innodb default charset=utf8;         create table blog_photograph (   photograph_Name varchar(20) not null check(photograph_Name!=''),   photograph_Date datetime not null,   photoAlbum_Name char(20)  not null,   photoURL varchar(90) not null,   foreign key(photoAlbum_Name) references blog_photoAlbum(photoAlbum_Name) on delete cascade on update cascade )engine=innodb default charset=utf8;