表A基于表B中距离的结果

Question

我有2个表，位置和邮政编码。

位置和zipcodes表都有一个点几何。

我写了一个查询，我可以为lng，lat传递字符串值，但是我想通过传递一个zipcode来做同样的事情，这就是距离结果的基础。

SELECT *, ST_distance(geometry::geography, ST_PointFromText('POINT(-118.0754445 32.4836479)', 4326)::geography) as dist 
  FROM locations
  WHERE st_dwithin(geometry, ST_PointFromText('POINT(-118.0754445 32.4836479)', 4326)::geography, 1609)
  ORDER BY dist;

Answer 1

将两个表放在FROM子句中（为它们指定别名）并使用您需要的zipcode添加where条件：

SELECT *, ST_distance(l.geometry::geography, zc.geometry::geography ) as dist 
  FROM locations AS l, zipcodes AS zc
  WHERE st_dwithin(l.geometry, zc.geometry::geography), 1609) AND
        zc.code = 11111
  ORDER BY dist;