For example, consider a federated union query across three sources.
例如，考虑一个跨三个数据源的联邦联合查询。
Should you decide to execute a further query, it would begin from these three elements.
如果执行进一步的查询，那么查询将从这3个元素开始。
Should you decide to execute a further query, it would begin from these three elements.
如果执行进一步的查询，那么查询将从这3个元素开始。
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