Rule 3: Write an escape clause.

规则3：写出一个例外条款。

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Instead, use a virtual table with a WHERE clause, or define the join as a view in the data source, and execute the rule on this view.

相反，可使用具有where子句的虚拟表，或者将连接作为数据源的视图进行定义，并在这一视图中执行规则。

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The old rule against stranding a preposition at the end of a clause, like "whom we've worked with", was a peeve of the 17th-century essayist John Dryden.

过去的语法规则不允许在句尾使用介词，比如“whom we've worked with”，但这是17世纪的散文家约翰·德莱顿（John Dryden）的臭毛病。

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