表执行条件LEC ？
您可通过定义具有过滤条件的虚拟表，来有效地减少从源所读取记录的数量，并减小规则的总执行时间。
You can effectively reduce the number of records that are read from the source, and reduce the overall execution time of a rule, by defining a virtual table with a filter condition.
还可以通过使用 WHERE 条件、ORDER BY、GROUP BY 子句执行过滤操作，或者执行常规基表适用的其他操作。
You can also perform operations such as filtering, using WHERE conditions, ORDER BY, GROUP BY, and other operations that would be possible with a regular base table.
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