Thanks everyone! Från: postgis-users [mailto:[email protected]] För didier peeters Skickat: den 4 juli 2019 14:46 Till: PostGIS Users Discussion Ämne: Re: [postgis-users] creating points from polygons, storing all attributes
That’s because you named the new geometry « the_geom » like the old one, and using « * » gets you all the attributes including « the_geom » . So either you list all the attributes you want to keep in the SELECT instead of using the « * » like this : CREATE TABLE NewPointLayer AS SELECT attr1, attr2, attr3, attr4, ST_PointOnSurface(the_geom)::geometry(Point,32632) AS the_geom FROM OldPolygonLayer , or you use another name for your new geometry and you drop the old geometry afterward (if you don’t want to have these 2 different geometry columns in your new table), like this : CREATE TABLE NewPointLayer AS SELECT *, ST_PointOnSurface(the_geom)::geometry(Point,32632) AS geom FROM OldPolygonLayer ; ALTER TABLE NewPointLayer DROP COLUMN the_geom; Didier Le 4 juil. 2019 à 14:26, [email protected]<mailto:[email protected]> a écrit : Thanks, I’ve tried that but get this error: ERROR: column "the_geom" is specified more than once SQL state: 42701 /Paul Från: postgis-users [mailto:[email protected]] För Derek Watling Skickat: den 4 juli 2019 13:55 Till: PostGIS Users Discussion Ämne: Re: [postgis-users] creating points from polygons, storing all attributes CREATE TABLE NewPointLayer AS SELECT *, ST_PointOnSurface(the_geom)::geometry(Point,32632) AS the_geom FROM OldPolygonLayer From: postgis-users <[email protected]<mailto:[email protected]>> On Behalf Of [email protected]<mailto:[email protected]> Sent: Thursday, 04 July 2019 13:47 To: [email protected]<mailto:[email protected]> Subject: [postgis-users] creating points from polygons, storing all attributes Hi, I would like to create a point table from a polygon table. One point in each polygon Query = CREATE TABLE NewPointLayer AS SELECT ST_PointOnSurface(the_geom)::geometry(Point,32632) AS the_geom FROM OldPolygonLayer But how do I write the query to get all the attributes from OldPolygonLayer to the NewPointLayer? Thanks in advance, Paul _______________________________________________ postgis-users mailing list [email protected]<mailto:[email protected]> https://lists.osgeo.org/mailman/listinfo/postgis-users
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