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    <p>Its not possible, the only way its possible on PHP would be when your using clusters / several nodes with a replication setup.</p> <p>Obviously you don't understand some of the more technical stuff in regards to mysql, but give this ago.</p> <pre><code>$master = mysql_connect("master_host","abc","abcdb"); $slave = mysql_connect("slave_host","xyz","xyzdb"); if(mysql_select_db("abc_db",$master) &amp;&amp; mysql_select_db("xyz_db",$slave)) { //Both Selected $sql = mysql_query("SELECT * FROM employee",$master); $rows = array(); while($row = mysql_fetch_assoc($sql)) { //Query the other $slave DB here! $slave_sql = mysql_query("SELECT * FROM department WHERE department_id = " . $row['id'],$slave); while($sub_row = mysql_fetch_assoc($slave_sql)) { $row = array_combine($sub_row,$row); } $rows[] = $row; } } </code></pre> <p>But thats not what you want to be doing really.</p> <p>Just incase your trying to join across 2 <em>databases</em> on the same server, as both your hosts in your code are <em>locahost</em>, this is possible</p> <pre><code>SELECT * FROM db1.employees db1_e,db2.records db2_r WHERE db1_e.employee_id = db2_r.record_eid </code></pre> <p>But not sever 1 to an external server without using replication, even then you can replication wont be much help.</p> <p>References and links:</p> <p><a href="http://nathan.rambeck.org/blog/2-joining-mysql-tables-across-multiple-databases" rel="nofollow noreferrer">http://nathan.rambeck.org/blog/2-joining-mysql-tables-across-multiple-databases</a></p> <p><a href="http://dev.mysql.com/doc/refman/5.0/en/replication.html" rel="nofollow noreferrer">http://dev.mysql.com/doc/refman/5.0/en/replication.html</a></p>
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