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I have two columns latitude and longitude. I am trying to create boundaries such that only points within the boundary is returned. For example i have this static lat/long (40.6681, -73.9806).

There are latitude/longitude coordinates in my database which are not within that static coordinate, how do I only select those coordinates within 40.6681, -73.9806? Here is my query: 

select houses from housing where borough = 'BROOKLYN' and latitude + longitude = st_within(40.6681, -73.9806);

The error message I see is:

Hint: No function matches the given name and argument types. You might need to add explicit type casts. Can someone guide me in the right direction?

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  • probably just a typo - you might want to check the longitude value - this needs to be around -74 for NY
    – Steven Kay
    Dec 3, 2016 at 21:41
  • Well i am trying to use park slope not the entire borough of brooklyn.
    – Micheal C.
    Dec 3, 2016 at 21:49
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    What Steven Kay is telling you is that if you want to be in the western hemisphere, your longitude should be is negative. 73.9806 is 73.9806 East. 73.9806W will be -73.9806
    – BradHards
    Dec 3, 2016 at 21:53

1 Answer 1

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You are not using the function properly. ST_WITHIN() takes two arguments both type geom.

For example:

ST_Within(geometry A, geometry B);

will return true if geometry A is completely inside geometry B.

You are going to want to try something like this:

select houses from housing where borough = 'BROOKLYN'
AND ST_WITHIN(ST_MakePoint(longitude, latitude), YOUR_BOUNDARY_GEOM);

see postgis docs

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  • Hey man, thanks for the response. So basically I can't have a static latlng, i need to turn 40.6681, 73.9806 into a geom correct?
    – Micheal C.
    Dec 3, 2016 at 21:45
  • Yes, you will have to convert it to a geom. Your boundary also need to be a geom.
    – Owen J Lamb
    Dec 3, 2016 at 21:51
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    That last point is critical, and it can't be a point (ST_Within for two points is never true). The boundary should be describing the extent of the are (e.g. borough) you are interested in, and the border won't match.
    – BradHards
    Dec 3, 2016 at 22:51

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