如果已从数据库导入一个以上的表，则可从不同的表取得字段。
If you had imported more than one table from your database, you could grab fields from different tables here.
以上示例有些难看，因为数据库很小。
The above sample is a little bit nasty because the database is so small.
以上是创建数据库业务规格的全过程。
This is all that you have to do to create a database business metric.
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