The member key column for the lowest level of the dimension must contain the keys that relate the fact table and the dimension table.

对应着维度最低级别的成员键列必须包含关联事实表和维度表的键。

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For example, for family info and a member date, the column key is info:date.

例如，对于系列 info 和成员 date，列键为 info:date。

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Used to choose the proper key if the selected column is a member of multiple key definitions.

如果选取的资料行为多重索引键定义的成员，则可用来选择适当的索引键。

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