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v.db.dropcolumn

Drops a column from the attribute table connected to a given vector map.

v.db.dropcolumn map=name [layer=string] columns=name [,name,...] [--verbose] [--quiet] [--qq] [--ui]

Example:

v.db.dropcolumn map=name columns=name

grass.script.run_command("v.db.dropcolumn", map, layer="1", columns, verbose=False, quiet=False, superquiet=False)

Example:

gs.run_command("v.db.dropcolumn", map="name", columns="name")

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
--help
    Print usage summary
--verbose
    Verbose module output
--quiet
    Quiet module output
--qq
    Very quiet module output
--ui
    Force launching GUI dialog

map : str, required
    Name of vector map
    Or data source for direct OGR access
    Used as: input, vector, name
layer : str, optional
    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.
    Used as: input, layer
    Default: 1
columns : str | list[str], required
    Name of attribute column(s) to drop
    Used as: input, dbcolumn, name
verbose: bool, optional
    Verbose module output
    Default: False
quiet: bool, optional
    Quiet module output
    Default: False
superquiet: bool, optional
    Very quiet module output
    Default: False

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

SOURCE CODE

Available at: v.db.dropcolumn source code (history)
Latest change: Monday Feb 10 14:42:02 2025 in commit 5fe1b99