A self join can be of any type, as long as the joined tables are the same.

既然联接的是同一个表，那么自联接可以是任一种类型。

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A self join is rather unique in that it involves a relationship with only one table.

自联接是相当独特的，它只涉及到仅仅一个表的关系。

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A new feature of the query optimizer supports a new type of index scan, called an index self-join path.

查询优化器的一项新特性支持一种新的索引扫描，即索引自连接路径。

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Once one dog attacks, the others are likely to join in, and self-defense becomes almost impossible, he added.

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