Spatial Query Postgis - sql

Question

I have a polygon city and polygon data that I import into PostgreSQL, PostGIS. These intersect with cities. The first thing I need to do is to print the id from the city table to the other table, but while doing this, it needs to get the id of the city where the polygon is located. I tried a few functions to do this but got an error. Can you help me design the SQL command line?
update maden_polygon set objectid = maden_polygon.ilce_id
from (SELECT maden_polygon.ilce_id as id ,ankara_ilce.objectid as ilce_id
FROM maden_polygon , ankara_ilce
WHERE st_intersects(maden_polygon.geom, ankara_ilce.geom)) as maden_polygon
where maden_polygon.ilce_id = anakara_ilce.object_id
(ERROR: table name "maden_polygon" specified more than once )
What I want to do is to print the objectid column in the ankara_ilce table to the mine_polygon ilce_id table.
While doing this,
Write the object_id of which mine is within the boundaries of which county.
SELECT
maden_polygon.ilce_id as id ,
ankara_ilce.objectid as ad ,
ankara_ilce.adi as adi
from maden_polygon , ankara_ilce
where St_intersects(ankara_ilce.geom , maden_polygon.geom ) as sorgu
where maden_polygon.id = sorgu.id ;
ERROR: syntax error at or near "as"
LINE 6: ...ntersects(ankara_ilce.geom , maden_polygon.geom ) as sorgu

Answer 1

I think the query is a simple as this:
UPDATE maden_polygon set objectid = ilce_id
FROM ankara_ilce
WHERE st_intersects(maden_polygon.geom, ankara_ilce.geom)
BUT - note that the st_intersects can return multiple records per maden_polygon if your polygons overlap, and that might give you inconsistent results. You could try using st_contains instead (being aware that some records might not update that way). OR, you could match on the centroid of the one polygon e.g.
UPDATE maden_polygon set objectid = ilce_id
FROM ankara_ilce
WHERE st_within(st_centroid(maden_polygon.geom), ankara_ilce.geom)
Good luck!