Handle Computed Values处理计算值

If you want to return calculated data values to your application, you can improve performance by running computations in your database rather than when the data is requested. 如果你想将计算出的数据值返回给应用程序，你可以通过在数据库中运行计算来提高性能，而不是在请求数据时运行。The application may require either precise calculations or approximate results. By using the Computed and the Approximation schema patterns, you can pre-compute and store the resulting values ahead of time (for example on insert or with a periodic task) so they are readily available when you request the data.应用程序可能需要精确计算或近似结果。通过使用Computed和Approximation模式，您可以提前预计算和存储结果值（例如在插入或周期性任务时），以便在您请求数据时随时可用。