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。

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.

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和其名称一样，每个if - then规则包含一个Boolean表达式，用于确定是否执行在then子句中指定的一个或多个操作。

As the name implies, each if-then rule consists of a Boolean expression that determines whether to execute one or multiple actions specified in the then clauses.

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对于所有字段，使用的任何规则应在子句之外。

For all fields, use any rules that are outside clauses.

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