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The skyline operator is the subject of an optimization problem, used in a query to filter results from a database to keep only those objects that are not worse than any other. This operator is an extension to SQL proposed by Börzsönyi et al. A classic example of application of the skyline operator involves selecting a hotel for a holiday. The user wants the hotel to be both cheap and close to the beach. However, hotels that are close to the beach may also be expensive. In this case, the skyline operator would only present those hotels that are not worse than any other hotel in both price and distance to the beach.

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  • Skyline operator
  • 天际线运算
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  • 天际线运算（英語：Skyline Operator）属于最佳化问题的范畴。用来查询数据库中的结果，并保证返回的每一个结果至少在某一方面不劣于其他结果。 这个运算符是SQL的一个扩充，由德国的Börzsönyi等人于2001年提出。 论文中所用的酒店示例是天际线运算的一个经典示例。当用户希望酒店是既便宜又靠近海滩，但是靠近海滩的酒店通常又比较昂贵时，天際線運算符可以保证其查询结果中，对于任意两个酒店，每一个酒店都至少在与海滩的距离或者价格中，不比另一个劣。 天际线运算返回的结果是数据库中一部分特殊的点，这些点构成了数据库的轮廓。这也是此运算得名的原因。
  • The skyline operator is the subject of an optimization problem, used in a query to filter results from a database to keep only those objects that are not worse than any other. This operator is an extension to SQL proposed by Börzsönyi et al. A classic example of application of the skyline operator involves selecting a hotel for a holiday. The user wants the hotel to be both cheap and close to the beach. However, hotels that are close to the beach may also be expensive. In this case, the skyline operator would only present those hotels that are not worse than any other hotel in both price and distance to the beach.
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  • 天际线运算（英語：Skyline Operator）属于最佳化问题的范畴。用来查询数据库中的结果，并保证返回的每一个结果至少在某一方面不劣于其他结果。 这个运算符是SQL的一个扩充，由德国的Börzsönyi等人于2001年提出。 论文中所用的酒店示例是天际线运算的一个经典示例。当用户希望酒店是既便宜又靠近海滩，但是靠近海滩的酒店通常又比较昂贵时，天際線運算符可以保证其查询结果中，对于任意两个酒店，每一个酒店都至少在与海滩的距离或者价格中，不比另一个劣。 天际线运算返回的结果是数据库中一部分特殊的点，这些点构成了数据库的轮廓。这也是此运算得名的原因。
  • The skyline operator is the subject of an optimization problem, used in a query to filter results from a database to keep only those objects that are not worse than any other. This operator is an extension to SQL proposed by Börzsönyi et al. A classic example of application of the skyline operator involves selecting a hotel for a holiday. The user wants the hotel to be both cheap and close to the beach. However, hotels that are close to the beach may also be expensive. In this case, the skyline operator would only present those hotels that are not worse than any other hotel in both price and distance to the beach.
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