有时候应用程序需要从给定表中删除所有的记录，以便清空日志记录或者装入新的一个月的销售数据。
Sometimes an application needs to delete all records from a given table to clean up a log or reload sales data for a new month.
以零售商为例，他可以决定啤酒库存量是多少。这不仅仅基于过去的销售记录，还可以基于天气预报，社会媒体上的聚会闲聊以及体育比赛的时间表。
A retailer, for instance, might decide how much beer to stock based not just on previous sales records, but also on weather forecasts, party chatter on social media and schedules for sports matches.
预备好每个月假设的工作表来记录下所有的销售情况和上月销售有关的活动。
Prepares a tentative monthly schedule to record all sales and other related actives for the preceding month.
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