折现是个很高级的课题，却经常在计算客户生命周期价值时被忽略。
Discounting is an advanced topic that is frequently ignored in customer lifetime value calculations.
计算客户生命周期价值。
图 3 中的 ProjectedBalance 作业从 ORDERS 表中获取上个月的订单，并为每个客户键计算订单总价值。
The ProjectedBalance job illustrated in Figure 3 retrieves last month's orders from the ORDERS table and calculates their total value for each customer key.
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