单个选择语句生成，联接被推到数据库。
A single select statement is generated and the join is pushed to the database.
我们推断，模式机制能够良好地适应于对离散的、单个选择的模型单元进行小范围的转换。
We concluded that the patterns mechanism is best-suited to small-scale transformations on discrete, individually selected model elements.
现在，当同一个查询运行时，生成的原生s QL是单个选择语句，在语句在数据库层联接来自不同目录的两个表，如图10所示。
Now, when the same query is run, the native SQL that is generated is a single select statement joining the two tables from the different catalogs at the database tier as shown in Illustration 10.
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