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GitHub
12 年
20130806_01.md
空间数据中对临近点的检索使用非常常见, 例如以经纬度为坐标点, 检索离这个点1公里范围内的其他点的信息. 最近有网友问到这样的问题,如何优化呢. ps 现在的版本可以直接支持,不需要使用子查询来支持了。 测试数据, 取自经纬度信息网站. insert into cust_jw ...
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