db.dropcolumn(1)

NAME
db.dropcolumn - Drops a column from selected attribute table.

KEYWORDS
database, attribute table

SYNOPSIS
db.dropcolumn
db.dropcolumn --help
db.dropcolumn [-f] table=name column=name [--help] [--verbose] [--quiet] [--ui]

  Flags:

-f
    Force removal (required for actual deletion of files)

--help
    Print usage summary

--verbose
    Verbose module output

--quiet
    Quiet module output

--ui
    Force launching GUI dialog

  Parameters:

table=name [required]
    Name of attribute table

column=name [required]
    Name of attribute column

DESCRIPTION
db.dropcolumn drops a column from an attribute table. If the -f force flag is not given then nothing is removed, instead a preview of the action to be taken is printed.

NOTES
db.dropcolumn is a front-end to db.execute to allow easier usage with a special workaround for the SQLite driver to support column drop also for SQLite tables.

EXAMPLE
Dropping a column (North Carolina sample dataset):

# work on own copy
g.copy vect=roadsmajor,myroads
db.describe -c myroads
# only shows what would happen:
db.dropcolumn myroads column=SHAPE_LEN
# actually drops the column
db.dropcolumn -f myroads column=SHAPE_LEN
db.describe -c myroads

SEE ALSO
db.describe, db.droptable, db.execute, v.db.dropcolumn, GRASS SQL interface

AUTHOR
Markus Neteler

SOURCE CODE

Available at: db.dropcolumn source code (history)

Accessed: Wednesday Jul 09 13:14:22 2025

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