full outer join和full join

Full Outer Join和Full Join是两个不同的概念。

Full Outer Join是一种连接操作，它在左表和右表中找到匹配的记录，并将它们合并成一个结果集。与其他连接类型不同的是，Full Outer Join会包括左表和右表中所有的记录，无论是否有匹配的记录。如果左表和右表中没有匹配的记录，也会将它们包括在结果集中。

Full Join是一种在两个表之间进行连接的操作，它返回左表和右表中的所有记录，无论是否有匹配的记录。如果左表和右表中没有匹配的记录，也会将它们包括在结果集中。Full Join实际上是Left Join和Right Join的组合，它会将两个连接的结果合并在一起。

总结起来，Full Outer Join和Full Join都是用于连接两个表的操作，不同之处在于Full Outer Join会包括左表和右表中所有的记录，而Full Join是将Left Join和Right Join的结果合并在一起。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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