jaw-crusher

摘要： 用一个简单的实例说明一下left join, right join, inner join，建立两个表，使用mysql做一下关联实验:create_db.sql:create database small_product;use small_product;create table `product` ( `id` int(10) unsigned NOT NULL auto_increment, `amount` int(10) unsigned default NULL, PRIMARY KEY (`id`)) ENGINE=MYISAM AUTO_INCREMENT=5... 阅读全文