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-- product_id is the primary key for this table. -- period_start and period_end indicates the start and end date for sales period, both dates are inclusive. -- The average_daily_sales column holds the ...

CPU 的运算速度极快，每秒能完成数十亿次计算，可一旦需要从内存调取数据，就必须停下等待。这就好比厨师做饭时，食材放在远处仓库，来回取货耗费的时间，就是 CPU 数据访问延迟，也就是它发出取数请求到拿到数据的间隔时长。 简单来说：CPU 本身的计算 ...