The optimizer calculates and compares the costs of each join method and selects the best one to use when evaluating query execution plans.

当评估查询执行计划时，优化器计算并比较每种连接方法的成本，然后选择要使用的最佳方法。

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This lets you avoid the development, deployment, and execution costs of building and manipulating classes in addition to the object instances of those classes.

除了类的对象实例之外，这样做还可以让您避免构建和操作类的开发、部署和执行成本。

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Initial execution of any query includes the costs of building up a query cache to enable faster execution of subsequent queries.

任何一个查询的首次执行都包含了构建一个查询缓存的性能损耗，以利于提高后续查询的执行速度。

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