阅读这篇关于代码项目的原创文章会对你有很大帮助:.

在以下位置找到原始版本:MySQL 中 JOIN 和 OUTER JOIN 的区别.

What's the difference between INNER JOIN, LEFT JOIN, RIGHT JOIN and FULL JOIN in MySQL?

Reading this original article on The Code Project will help you a lot: Visual Representation of SQL Joins.

Also check this post: SQL SERVER – Better Performance – LEFT JOIN or NOT IN?.

Find original one at: Difference between JOIN and OUTER JOIN in MySQL.