Note: This document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade, and read the current manual page.
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
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
SOURCE CODE
Available at:
v.db.dropcolumn source code
(history)
Latest change: Mon Nov 18 20:15:32 2019 in commit: 1a1d107e4f6e1b846f9841c2c6fabf015c5f720d
Note: This document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade, and read the current manual page.
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GRASS Development Team,
GRASS GIS 7.8.8dev Reference Manual