v.db.dropcolumn(1grass) GRASS GIS User's Manual v.db.dropcolumn(1grass)
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 ac-
cess 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 speci-
fied 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
SOURCE CODE
Available at: v.db.dropcolumn source code (history)
Accessed: unknown
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GRASS 7.8.7 v.db.dropcolumn(1grass)
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