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本文介绍了空间数据库的基本概念，重点解析了Skyline查询，一种多维度数据库中的重要point query。Skyline通过domination概念找出数据集中不受其他点支配的点，形成天际线。文中还给出了一个经典的Skyline查询算法，并展示了C++实现Skyline查询的简单程序。参考文献包括Skyline操作的起源和相关研究。
〇、引子——空间数据库
A spatial database is a database that is optimized to store and query data that represents objects defined in a geometric space. Most spatial databases allow representing simple geometric objects such as points, lines and polygons.
Spatial data management refers to applications that rely mostly on two-dimensional or layered two-dimensional data. There are two main types of query for spatial database:
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