All events associated with a single execution of the sample application are retrieved.
与样本应用程序的一次执行关联的所有事件被检索。
The problem is that EXPLAIN provides estimates for only a single execution of a given query.
但问题是,EXPLAIN提供的只是特定查询的一次执行的估计值。
The next step is to create an instance of QueryExecution, a class that represents a single execution of a query.
下一步是创建QueryExecution的实例,这个类表示查询的一个执行。
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