postgres 空间索引 [英] postgres spatial indexing

问题描述

我似乎找不到太多关于此的文档.在postgres上创建数据库/表支持这样的查询的最简单方法是什么 SELECT * FROM table WHERE distance(POINT(0,0), table.location) <= 1000m;其中 POINT(0,0) 和 table.location 应该是纬度/经度对，1000m 是 1000 米.我应该如何索引该表?谢谢.

I can't seem to find much documentation on this. What's the simplest way to create a database/table on postgres supporting a query like this SELECT * FROM table WHERE distance(POINT(0,0), table.location) <= 1000m; Where POINT(0,0) and table.location should be latitude/longitude pair, and 1000m is 1000 meters. And how should I go about indexing that table? Thanks.

推荐答案

PostgreSQL支持表达式索引和部分索引，你可以混合使用.

PostgreSQL support indexes on expressions and also partial indexes, you can probably mix them.

这只是一个随机猜测，我不知道它是否有效，但请尝试一下:

This is just a random guess, I don't know if it works, but give it a try:

CREATE INDEX foobar ON table (distance(POINT(0,0), location))
 WHERE distance(POINT(0,0), location) <= 1000;

http://www.postgresql.org/docs/9.0/交互式/索引表达式.html

http://www.postgresql.org/docs/9.0/交互式/indexes-partial.html

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