Hi Carsten,
What you need is a *left join* :
|select grid.gid, count(kioskdhd3.geom) AS totale
FROM grid
LEFT JOIN kioskdhd3
ON st_contains(grid.geom,kioskdhd3.geom)
GROUP BY grid.gid;|
Note that I changed the * in count to a column from your points table
because you only want to count when you have a non-null value in your
points table.
Regards,
Tom
On 16-3-2013 16:53, Carsten Hogertz wrote:
I've got a simple problem: I want to count the number of points within
a set of polygons.
I have a SQL already but it only gives back the gid of the polygone
that actually contains points.
My tables: a polygon layer with 19.000 rows and a point layer with 450
rows.
The following SQL
|select grid.gid, count(*) AS totale FROM grid, kioskdhd3 WHERE
st_contains(grid.geom,kioskdhd3.geom) GROUP BY grid.gid;
|
return only some 320 polygons that actually contain points. But I want
all polygons returned, even thought the number of points is 0.
Of course it has to do with my WHERE-clause. Where do I have to put in
my st_contains?
Thank you Carsten
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