mysql的全外连接

MySQL不支持全外连接。MySQL中只提供了内连接、左外连接和右外连接三种类型的连接。全外连接可以返回左表和右表中的所有记录，即使没有匹配的记录也会返回。然而，MySQL不支持这种类型的连接。如果需要使用全外连接，可以考虑使用其他数据库管理系统，如Oracle或SQL Server。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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