[postgis-users] getting unexpected results on an ST_Intersects query

[islanis at infomed.sld.cu]

"Hugues François" <hugues.francois at irstea.fr> escribió:

> Hello,
>
> It's difficult to give an answer since you don't tell us a lot about  
> unexpected results buy you could try something like (will not work  
> if  a ft_cubo's polygon intersects different sigfre_cub_adm_munic  
> polygons) :
>
> UPDATE
>   ft_cubo
> SET
>   gidmunic = mgid
> FROM (
> SELECT DISTINCT ft_cubo.gid AS cgig, sigfre_cub_adm_munic.gid AS mgid
> FROM sigfre_cub_adm_munic, ft_cubo
> WHERE
> ST_Intersects(ft_cubo.the_geom,sigfre_cub_adm_munic.the_geom)
> ) AS foo
> WHERE gid = cgid

this neither work, is doing the same thing, look to the picture, there  
are 2 towns, one is divided in many pieces, but this town is still the  
same town and this towns id, is the same that the towns id of one  
piece picture town. i need to do this. please

>
> HTH
>
> If it's not give the expected results, you can work on the subselect  
> query to return the expected unique gid pairs.
>
> Hugues.
>
>
>
> -----Message d'origine-----
> De : postgis-users-bounces at lists.osgeo.org  
> [mailto:postgis-users-bounces at lists.osgeo.org] De la part de  
> islanis at infomed.sld.cu
> Envoyé : samedi 5 avril 2014 21:28
> À : postgis-users at lists.osgeo.org
> Objet : [postgis-users] getting unexpected results on an ST_Intersects query
>
> Hi folks, I'm having problems when I try to run a simple query to  
> update the gidmunic field of ft_cubo layer, and it assigns a value  
> that does not exists in said field, please, i need help , the two  
> layers are multipolygon type. what should I do?
>
>
> UPDATE
>   ft_cubo
> SET
>   gidmunic = sigfre_cub_adm_munic.gid
> FROM sigfre_cub_adm_munic
> WHERE
> ST_Intersects(ft_cubo.the_geom,sigfre_cub_adm_munic.the_geom);
>
>
>
> thanks in advance
>
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