INNER JOIN，LEFT JOIN，RIGHT JOIN和FULL JOIN有什么区别? [英] What's the difference between INNER JOIN, LEFT JOIN, RIGHT JOIN and FULL JOIN?
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问题描述
INNER JOIN，LEFT JOIN，RIGHT JOIN和FULL JOIN有什么区别
在 MySQL 中?
What's the difference between INNER JOIN, LEFT JOIN, RIGHT JOIN and FULL JOIN
in MySQL?
推荐答案
Reading this original article on The Code Project will help you a lot: Visual Representation of SQL Joins.
也请查看此帖子: SQL SERVER –更好的性能-左联接还是不联接?.
Find original one at: Difference between JOIN and OUTER JOIN in MySQL.
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