v.db.addcolumn - Adds one or more columns to the attribute table connected to a given vector map.

       Moritz Lennert (mlennert@club.worldonline.be)

v.db.addcolumn  adds  one  or  more  column(s) to the attribute table connected to a given vector map. It
       automatically checks the connection for the specified layer.

       Adding a single column:
       g.copy vect=roadsmajor,myroads
       v.db.addcolumn myroads columns="slope double precision"
       v.info -c myroads

       Adding two columns:
       g.copy vect=roadsmajor,myroads
       v.db.addcolumn myroads columns="slope double precision,myname varchar(15)"
       v.info -c myroads

       vector, attribute table, database

v.db.addcolumn  - Adds one or more columns to the attribute table connected to a given vector map.

v.db.addcolumn is a front-end to db.execute to allow easier usage.  The supported types of columns depend
       on the database backend. However, all backends should support VARCHAR, INT, DOUBLE PRECISION and DATE.

       The existing database connection(s) can be verified with v.db.connect.

db.connect,db.execute,v.db.addtable,v.db.connect,v.db.dropcolumn,v.db.droptable,v.db.select,v.db.updateGRASSSQLinterface

       Available at: v.db.addcolumn source code (history)

       Accessed: Friday Apr 04 01:21:12 2025

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       © 2003-2025 GRASS Development Team, GRASS GIS 8.4.1 Reference Manual

GRASS 8.4.1                                                                               v.db.addcolumn(1grass)

v.db.addcolumnv.db.addcolumn--helpv.db.addcolumnmap=name   [layer=string]   columns=nametype[,nametype,...]   [--help]   [--verbose]
       [--quiet]  [--ui]

   Flags:--help
           Print usage summary

       --verbose
           Verbose module output

       --quiet
           Quiet module output

       --ui
           Force launching GUI dialog

   Parameters:map=name[required]
           Name of vector map
           Or data source for direct OGR access

       layer=string
           Layer number where to add column(s)
           Vector features can have category values in different layers. This number determines which  layer  to
           use. When used with direct OGR access this is the layer name.
           Default: 1columns=nametype[,nametype,...] [required]
           Name and type of the new column(s) (’name type [,name type, ...]’)
           Types depend on database backend, but all support VARCHAR(), INT, DOUBLE PRECISION and DATE. Example:
           ’label varchar(250), value integer’