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I tried to process the following query with PgAdmin III, but it doesn't work and the hint provided doesn't make sense to me :

UPDATE grille_segments_finale SET shipping_cost = 1000000 WHERE st_intersects(grille_segments_finale.geom::LineString, countries.geom::MultiPolygon) is true ;

And I get: ERREUR: le type « linestring » n'existe pas LINE 6: WHERE st_intersects(grille_segments_finale.geom::LineString,... ^

********** Erreur **********

ERREUR: le type « linestring » n'existe pas État SQL :42704 Caractère : 191

Could you help me please? The geometry "LineString" is the right geometry type of my table ("grille_segments_finale") so I can't really find out where I am wrong...

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    I can't explain why, but leave out out the casts and it probably works: (grille_segments_finale.geom, countries.geom)
    – user30184
    Commented Apr 22, 2016 at 15:56
  • It didn"t work either, so I decided to use the "Spacial query" tool with QGIS to find which parts of "grille_segments_finale" intersect parts of "countries".
    – user37103
    Commented Apr 24, 2016 at 19:02
  • Edit : I think it didn't worked because I asked to find, for each part of "grille_segments_finale", if it was intersecting one specific part of "countries" (for each part of "countries"). But what I want is to know is, for each part of "grille_segments_finale", if it intersects one part of "countries". So maybe it's because of that. The process is running on QGIS and should be over tomorrow so I don't know if I will try to find a new method and to implement it on postgreSQL...
    – user37103
    Commented Apr 24, 2016 at 19:14
  • What do you mean by "It didn't work either"? Did you still get the same error?
    – user30184
    Commented Apr 24, 2016 at 19:48

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