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)
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