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<!--$Id: db_join.so,v 11.22 2002/08/18 21:17:26 bostic Exp $-->
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<title>Berkeley DB: db join</title>
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<h3><i>db</i> <b>join</b></h3>
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<h3><pre>db join
<i>db.cX</i>
<i>db.cY</i>
<i>db.cZ</i>
...
</pre></h3>
<h3>Description(db join)</h3>
<p>The <i>db</i> <b>join</b> command joins the specified cursors and returns a
cursor handle that can be used to iterate through the joined {key data}
pairs. The returned cursor handle is bound to a Tcl command of the form
<b>dbN.cX</b>, where X is an integer starting at 0 (for example,
db0.c0 and db0.c1). It is through this Tcl command that the script
accesses the cursor methods.</p>
<p>The returned join cursor has limited cursor functionality, and only the
<i>dbc</i> <b>get</b> and <i>dbc</i> <b>close</b> commands will succeed.</p>
<p>See <a href="../ref/am/join.html">Equality join</a> for more information on
the underlying requirements for joining.</p>
<p>In a transaction-protected environment, all the cursors listed must have
been created within the same transaction.</p>
<p>In the case of error, a Tcl error is thrown.</p>
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