To query by distance, you must use a projected coordinate system.

要按照距离进行查询，必须使用投影坐标系。

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If any of these assumptions are not valid for your database, you have to make adjustments that vary from trivial (for column names) to somewhat involved (in the case of a projected coordinate system).

如果这些假设对于您的数据库不成立，那么必须做某些调整，这些调整可能很简单(比如对于列名)，也可能比较复杂(比如对于投影坐标系)。

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