NAME

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

KEYWORDS

vector, attribute table, database

SYNOPSIS

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

DESCRIPTION

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.

NOTES

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.

EXAMPLES

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

AUTHOR

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

SOURCE CODE

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