NAME

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

KEYWORDS

       vector, attribute table, database

SYNOPSIS

       v.db.addcolumn
       v.db.addcolumn --help
       v.db.addcolumn  map=name   [layer=string]   columns=name  type[,name  type,...]   [--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: 1

       columns=name type[,name type,...] [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’

DESCRIPTION

       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.

NOTES

       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.

EXAMPLES

       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

SEE ALSO

        db.connect, db.execute,  v.db.addtable,  v.db.connect,  v.db.dropcolumn,  v.db.droptable,
       v.db.select, v.db.update
       GRASS SQL interface

AUTHOR

       Moritz Lennert (mlennert@club.worldonline.be)

SOURCE CODE

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

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       © 2003-2019 GRASS Development Team, GRASS GIS 7.8.2 Reference Manual