The formula for determining the number of communication channels is the combinatorial formula for the number of pairs you can select from n items, without regard to order. The formula 4 is as follows

决定沟通连接数量的公式就是你从数量n中挑选出配对数量的公式，不必考虑顺序。

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Important: the Select statement of the SQL Query formula must include all the fields referenced in the view's columns.

重点：SQL查询公式的选择语句必须包括视图列中引用的全部字段。

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In this window, make sure that you select the Insert Subform based on formula option, as shown in figure 5.

在这个窗口中，确保您选择Insert Subform based on formula选项，如图5所示。

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