【自连接(self-joins)】 在某些状况下，可能需要比较来自同一个表的两组信息才能获得所需的结果。
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有几种方法可以实现这个结果——自联接(self-joins)， NOT EXISTS 子查询等等。但是最简单的方法可能是使用GROUP BY：
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Self-Joins and Aliases 自身连接与别名
Self Joins 自连接
Self Non-Equi-Joins 不相等条件的自连接
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This step requires a minimum of 3 tables to be joined (where the 3 tables can include self-joins).
这个步骤至少需要3个连接表(3个连接表中包含自连接)。
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The self-interest paradigm does not go into quarantine when one joins or leads a non-profit.
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Willis does his cutesy, self-adoring thing, and most of the cast joins in, including Andie MacDowell as his love interest and Danny Aiello as his sidekick.
NEWYORKER: Hudson Hawk
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