[Qgis-user] querying a shapefile

[Micha Silver]

Nik Go wrote:
> Hello. Happy new year to all.
>
> I have a shapefile of cities, is it possible to do the following in QGIS
>
>     * determine and visually display all cities with attribute "x" or "y"
>
Yes, in version 1.4 we now have, on the Layer->Properties->General tab a 
"Subset" windows and "Query builder" button to create a subset of the 
vector layer by attribute column.

For the other two questions I don't know of a simple answer in QGIS. The 
GRASS module "v.to.db option=sides" would do it, but you'd need a 
topologically correct vector layer.
 
>
>     * find out if the "x" cities share a border with other "x" cities
>           o if they do, I want to add an attribute to the database
>             indicating it as a neighbor of another "x" city
>     * find out if the "y" cities share a border with other "y" cities
>           o if they do, I want to add an attribute to the database
>             indicating it as a neighbor of another "y" city
>
> Thank you and regards.
>
> Nik
>
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