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Editorial Team
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Asked: 2026-05-24T16:16:39+00:00

Places Table PlaceId PK Name GeoPoint (GeoPoint type) etc… PlaceCats Table (the join table)

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Places Table

  • PlaceId PK
  • Name
  • GeoPoint (GeoPoint type)
  • etc…

PlaceCats Table (the join table)

  • PlaceId PK FK
  • CatId PK FK

PlaceCategories Table

  • CatId PK
  • Name
  • etc…

Here’s my query, to return places, with entries in the PlaceCats table (by a series of catIds), and within 25km of a Lat/Lng value.

SELECT Places.* 
FROM Places 
     INNER JOIN PlaceCats 
             ON Places.PlaceId = PlaceCats.PlaceId 
WHERE PlaceCats.CatId IN (2,3,4,5) 
AND Places.GeoPoint.STDistance(geography::Point(35.75094975999387, 139.39780220389366, 4326)) < ((25 * 1000)) 
ORDER BY Places.Name ASC

It’s returning places, but I need to add DISTINCT after the SELECT… apparently you can’t use DISTINCT when selecting geography data. I need to make sure I’m not getting the same place multiple times (as they can have multiple entries in the join table).

Update

When I insert a place into the Places table, the GeoPoint is set like so:

SqlGeography.Point(sentPlace.Lat.Value, sentPlace.Lng.Value, 4326);
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1 Answer

  1. Editorial Team

    It look to me like you have your long/lats the wrong way round.

    As for selecting DISTINCT geographies, you can perform the DISTINCT operation over the WKT (Well Known Text) in a nested query, see below:

    SELECT 
GEOGRAPHY::STGeomFromText(WKT, [PROJECTION]) AS GEOG
FROM
(
    SELECT DISTINCT
    GEOG.STAsText() AS WKT
    FROM 
    [TABLE_NAME]
) a

    Your query would look something like this:

    SELECT 
    a.* 
,   GEOGRAPHY::STGeomFromText(WKT, 4326) AS GEOG
FROM 
(
    SELECT DISTINCT
        Places.[COL1]
    ,   Places.[COL2]
    ,   Places.[COL3]
    ,   Places.[COL4]
    ...
    ...
    ,   Places.GeoPoint.STAsText() AS WKT
    FROM 
    Places 
    INNER JOIN 
    PlaceCats 
    ON 
    Places.PlaceId = PlaceCats.PlaceId 
    WHERE PlaceCats.CatId IN (2,3,4,5) 
    AND 
    Places.GeoPoint.STDistance(GEOGRAPHY::Point(35.75094975999387, 139.39780220389366, 4326)) < ((25 * 1000)) 
    ORDER BY Places.Name ASC 
)a

    One further tip, assuming you have a spatial index on your table, it speeds spatial queries up no end by using an index hit:

    SELECT *
FROM 
[TABLE_NAME] WITH(INDEX([INDEX_NAME]))
WHERE
GEOG.STIntersects.(GEOGRAPHY::Point([Longitude], [Latitude], 4326)) = 1
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