db.dropcolumn.1grass - Man Page

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

-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

database=name

Name of database

driver=name

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: Monday Sep 09 08:49:52 2024

Main index | Database index | Topics index | Keywords index | Graphical index | Full index

© 2003-2024 GRASS Development Team, GRASS GIS 8.4.0 Reference Manual

Info

GRASS 8.4.0 GRASS GIS User's Manual