Relational guidelines such as join, MSJOIN, NLJOIN, and HSJOIN can be used to specify the join order and the join type.

关系准则，比如join、MSJOIN、NLJOIN和HSJOIN都可以用来指定连接顺序和连接类型。

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For example, the join class contains a left-join expression, a right-join expression, a join type, and a join criteria.

举例来说，join类包含一个左连接表达式、一个右连接表达式、一个连接类型和一个连接标准。

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For example, the join class contains a left-join expression, a right-join expression, a join type, and a join criteria.

举例来说，join类包含一个左连接表达式、一个右连接表达式、一个连接类型和一个连接标准。

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