[GRASS-user] concatenating/combining two table fields for multi-field join

[Moritz Lennert]

On 06/08/13 12:24, Timmie wrote:
>> How can I perform the corresponding command on the command for the GRASS
>> table?
> In
> http://grass.osgeo.org/grass65/manuals/sql.html I found:
> v.db.update vectormap column=column3 qcolumn="column1 || column2"
>
> running the command on my data yields:
>
> #dbmi: Protocol error
> #dbmi: Invalid procedure 107
> #ERROR: Fehler beim Ausführen von: 'UPDATE vectormap SET joinkey="a_value
>
> What causes this error and what could I do to prevent it?

Which database backed are you using (dbf, sqlite, postgresql) ? The 
manual does state that this command "does not work for DBF driver".

Moritz