postgis-在ST_POINT中使用字段名称

Question

I'm trying to run this:

SELECT 
    * 
FROM 
    creator.maps 
WHERE 
    ST_DISTANCE( 
        ST_POINT(10,10)::geography, 
        ST_POINT(geolocation)::geography 
    ) 
    < 50000;

But it's giving me the error:

HINT:  No function matches the given name and argument types. You might need to add explicit type casts.

geolocation is a POINT type

How do I fix this?

Error:

ERROR:  function st_point(point) does not exist

Answer 1

The type point can be converted to a PostGIS geometry first, then to a geography .

SELECT 
    * 
FROM 
    creator.maps 
WHERE 
    AND ST_DISTANCE( 
          ST_POINT(10,10)::geography, 
          geolocation::geometry::geography 
      ) 
      < 50000;

Note that Postgres native geometric functions are fairly limited so you may want to consider storing data as geometry(point) instead of point