v.db.dropcolumn.1grass - Man Page

Drops a column from the attribute table connected to a given vector map.


vector, attribute table, database


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


map=name [required]

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

columns=name[,name,...] [required]

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

See Also

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

Source Code

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

Accessed: Tuesday Mar 19 11:02:39 2024

Main index | Vector index | Topics index | Keywords index | Graphical index | Full index

© 2003-2024 GRASS Development Team, GRASS GIS 8.3.2 Reference Manual


GRASS 8.3.2 GRASS GIS User's Manual