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db.dropcolumn(1grass) GRASS GIS User's Manual db.dropcolumn(1grass)

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 [database=name] [driver=name] [--help] [--verbose] [--quiet] [--ui]

Flags:


Force removal (required for actual deletion of files)

Print usage summary

Verbose module output

Quiet module output

Force launching GUI dialog

Parameters:


Name of attribute table

Name of attribute column

Name of database

Name of database driver
Options: dbf, odbc, ogr, sqlite, pg

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: Thursday Aug 01 05:17:15 2024

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GRASS 8.4.0