MySql（十五）--索引两表优化

最新推荐文章于 2022-08-07 02:43:08 发布

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本文介绍了一个SQL脚本，用于在MySQL数据库中创建两个表：'class'和'book'，并为每个表插入了随机生成的数据。此外，还添加了索引以优化查询性能。

create table if not exists `class`(
 `id` INT(10) unsigned NOT NULL auto_increment,
 `card` INT(10) unsigned NOT NULL,
 primary key(`id`)
)ENGINE=INNODB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

create table if not exists `book`(
 `bookid` INT(10) unsigned NOT NULL  auto_increment,
 `card` INT(10) unsigned NOT NULL,
 primary key(`bookid`)
)ENGINE=INNODB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

insert into class(card) values(floor(1+(RAND()*20)));
insert into class(card) values(floor(1+(RAND()*20)));
insert into class(card) values(floor(1+(RAND()*20)));
insert into class(card) values(floor(1+(RAND()*20)));
insert into class(card) values(floor(1+(RAND()*20)));
insert into class(card) values(floor(1+(RAND()*20)));
insert into class(card) values(floor(1+(RAND()*20)));
insert into class(card) values(floor(1+(RAND()*20)));
insert into class(card) values(floor(1+(RAND()*20)));
insert into class(card) values(floor(1+(RAND()*20)));
insert into class(card) values(floor(1+(RAND()*20)));
insert into class(card) values(floor(1+(RAND()*20)));
insert into class(card) values(floor(1+(RAND()*20)));
insert into class(card) values(floor(1+(RAND()*20)));
insert into class(card) values(floor(1+(RAND()*20)));
insert into class(card) values(floor(1+(RAND()*20)));
insert into class(card) values(floor(1+(RAND()*20)));
insert into class(card) values(floor(1+(RAND()*20)));
insert into class(card) values(floor(1+(RAND()*20)));
insert into class(card) values(floor(1+(RAND()*20)));

insert into book(card) values(floor(1+(RAND()*20)));
insert into book(card) values(floor(1+(RAND()*20)));
insert into book(card) values(floor(1+(RAND()*20)));
insert into book(card) values(floor(1+(RAND()*20)));
insert into book(card) values(floor(1+(RAND()*20)));
insert into book(card) values(floor(1+(RAND()*20)));
insert into book(card) values(floor(1+(RAND()*20)));
insert into book(card) values(floor(1+(RAND()*20)));
insert into book(card) values(floor(1+(RAND()*20)));
insert into book(card) values(floor(1+(RAND()*20)));
insert into book(card) values(floor(1+(RAND()*20)));
insert into book(card) values(floor(1+(RAND()*20)));
insert into book(card) values(floor(1+(RAND()*20)));
insert into book(card) values(floor(1+(RAND()*20)));
insert into book(card) values(floor(1+(RAND()*20)));
insert into book(card) values(floor(1+(RAND()*20)));
insert into book(card) values(floor(1+(RAND()*20)));
insert into book(card) values(floor(1+(RAND()*20)));
insert into book(card) values(floor(1+(RAND()*20)));
insert into book(card) values(floor(1+(RAND()*20)));
insert into book(card) values(floor(1+(RAND()*20)));