## NAME

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

## KEYWORDS

vector, attribute table, database

## SYNOPSIS

v.db.dropcolumn.py
v.db.dropcolumn.py --help
v.db.dropcolumn.py 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)

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