Find centralized, trusted content and collaborate around the technologies you use most.
Teams
Q&A for work
Connect and share knowledge within a single location that is structured and easy to search.
和有什么区别Left Join and Left Outer Join?
Left Join and Left Outer Join
它们在 MySQL 中是一样的。ALEFT JOIN是 的同义词或简写LEFT OUTER JOIN。
LEFT JOIN
LEFT OUTER JOIN
空无一人。关键字 OUTER 是可选的。他们的意思是一样的。