MINUS and UNIQUE keywords are directly mapped to the DB2 database product.

MINUS 和 UNIQUE 关键词被直接映射到 DB2 数据库产品。

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And we put forward the classified node which can be directly mapped into relation.

引入分级节点的概念，分级节点可以直接映射为关系。

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The Oracle (+) outer and cross join syntax is directly mapped to the DB2 database product.

Oracle(+)外连接和交叉连接语法被直接映射到DB 2数据库产品。

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