geometry

Recent decades have witnessed a surge of interest in Discrete Geometry and Convex Polytopes. This book serves as a gateway to some captivating facets of this field, encompassing both well-established concepts and lesser-known, historical, and cutting-edge findings. It is crucial to note that this is not intended as an exhaustive or conventional introduction to the field. The content originated from lecture notes for a course taught at MIT, subsequently expanded upon due to the richness and relative scarcity of the material elsewhere. The presentation prioritizes self-containment to the greatest extent possible. This work should not be mistaken for a research monograph or a comprehensive survey of results. The exposition varies in complexity, aiming to balance accessibility with depth.

在SQL中，处理地理数据和基于经纬度的计算是一项重要的任务，特别是在数据分析、地理位置服务或地图应用中。这里我们将深入探讨如何使用geometry类型来处理这类数据。geometry是MySQL中的一个数据类型，允许存储和操作几何对象，如点、线、面等。经纬度可以视为点，用坐标表示，经度表示水平位置，范围从-180到180度，纬度表示垂直位置，范围从-90到90度。SQL脚件中可能包含创建、查询和操作包含经纬度信息的几何对象的脚本。