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

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]

--help
 
Print usage summary
--verbose
 
Verbose module output
--quiet
 
Quiet module output
--ui
 
Force launching GUI dialog

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

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)
Main index | Vector index | Topics index | Keywords index | Graphical index | Full index
© 2003-2018 GRASS Development Team, GRASS GIS 7.4.3 Reference Manual
GRASS 7.4.3

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