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。
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。
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。
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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