Geografic-Information-System/scripts/v.db.addcolumn/v.db.addcolumn.html

<h2>DESCRIPTION</h2>

<em>v.db.addcolumn</em> adds one or more column(s) to the attribute table
connected to a given vector map. It automatically checks the connection for the
specified layer.

<h2>NOTES</h2>

<em>v.db.addcolumn</em> is a front-end to <em>db.execute</em> to allow easier usage.

The supported types of columns depend on the database backend. However, all
backends should support VARCHAR, INT, DOUBLE PRECISION and DATE.
<p>The existing database connection(s) can be verified with <em>v.db.connect</em>.

<h2>EXAMPLES</h2>

Adding a single column:<br>
<div class="code"><pre>
g.copy vect=roadsmajor,myroads
v.db.addcolumn myroads columns="slope double precision"
v.info -c myroads
</pre></div>

<p>Adding two columns:<br>
<div class="code"><pre>
g.copy vect=roadsmajor,myroads
v.db.addcolumn myroads columns="slope double precision,myname varchar(15)"
v.info -c myroads
</pre></div>

<h2>SEE ALSO</h2>

<em>
<a href="db.connect.html">db.connect</a>,
<a href="db.execute.html">db.execute</a>,
<a href="v.db.addtable.html">v.db.addtable</a>,
<a href="v.db.connect.html">v.db.connect</a>,
<a href="v.db.dropcolumn.html">v.db.dropcolumn</a>,
<a href="v.db.droptable.html">v.db.droptable</a>,
<a href="v.db.select.html">v.db.select</a>,
<a href="v.db.update.html">v.db.update</a><br>
<a href="sql.html">GRASS SQL interface</a>
</em>


<h2>AUTHOR</h2>

Moritz Lennert (mlennert@club.worldonline.be)

<p><i>Last changed: $Date$</i>