在无泛关系假设时,对两个关系进行自然连接中被丢失的元组称为____。
悬挂元组
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上一篇:The Getty Center1.The Getty Center attracts 1.1 million visitors a year. It is one of the most popular art museums in the US. One reason for its popularity may be that the Getty is free. No tickets to buy, and no reservations needed. There is
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