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v.db.dropcolumn(1grass) Grass User's Manual v.db.dropcolumn(1grass)

v.db.dropcolumn - Drops a column from the attribute table connected to a given vector map.

vector, attribute table, database

v.db.dropcolumn
v.db.dropcolumn --help
v.db.dropcolumn map=name [layer=string] columns=name[,name,...] [--help] [--verbose] [--quiet] [--ui]


Print usage summary

Verbose module output

Quiet module output

Force launching GUI dialog


Name of vector map
Or data source for direct OGR access

Layer number or name
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

Name of attribute column(s) to drop

v.db.dropcolumn drops a column from the attribute table connected to a given vector map. It automatically checks the connection for the specified layer. v.db.dropcolumn omits to delete the ’cat’ column which is relevant to keep the connection between vector map and table.

v.db.dropcolumn is a front-end to db.execute to allow easier usage.

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

Dropping a column: 

g.copy vect=roadsmajor,myroads
v.info -c myroads
v.db.dropcolumn myroads column=SHAPE_LEN
v.info -c myroads

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

Markus Neteler

Last changed: $Date: 2011-11-08 22:24:20 +0100 (Tue, 08 Nov 2011) $

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

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© 2003-2019 GRASS Development Team, GRASS GIS 7.6.0 Reference Manual

GRASS 7.6.0