我们真正需要的是通过某种途径计算这个函数的不动点。
What we really want is some way of calculating the fixed point of such a function.
可能理解它的最佳途径是接触一个实际的例子，我们需要一个递归函数。
Probably the best way to understand is with a real example and to do that, we need a recursive function.
DB 2 9中包含的标准SQL olap函数为回答这些类型的问题提供了有效的途径。
IBM DB2 provides an efficient way to answer these kinds of questions using standard SQL OLAP functions that are included as part of DB2 9.
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