NAME
v.db.dropcolumn - Drops a column from the attribute table connected to a given vector map.
KEYWORDS
vector, database, attribute table
SYNOPSIS
v.db.dropcolumn
v.db.dropcolumn help
v.db.dropcolumn map=name layer=string columns=name[,name,...] [--verbose] [--quiet]
Parameters:
- map=name [required]
- Name of vector map
- Or data source for direct OGR access
- layer=string [required]
- Layer number or name
- A single vector map can be connected to multiple database tables. This number determines which table 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 13:24:20 -0800 (Tue, 08 Nov 2011) $
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