Check your underlying database to make sure your fact tables contain data.

检查基础数据库，确保事实表中含有数据。

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In fact, we may not have selected the database software yet.

事实上，我们可能也没有选定的数据库软件。

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In fact, we may not have selected the database software yet.

事实上，我们可能也没有选定的数据库软件。

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