Querying two tables... in MySQL - mysql

Question

CREATE TABLE IF NOT EXISTS `document`
(
`intId` int(11) NOT NULL auto_increment,
`chDocumentTitle` varchar(32) default NULL,
`dtLastUpdate` datetime default NULL,
`chUser` varchar(32) default NULL,
`chLink` varchar(256) default NULL,
`Keyword` varchar(256) default NULL,
`intParentid` int(11) NOT NULL,
PRIMARY KEY (`intId`),
KEY `dtLastUpdate` (`dtLastUpdate`,`chUser`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=10 ;
CREATE TABLE IF NOT EXISTS `category`
(
`intId` int(11) NOT NULL auto_increment,
`chName` varchar(32) NOT NULL,
`Isactive` tinyint(1) NOT NULL default '0',
`chnestUnder` int(5) NOT NULL default '0',
PRIMARY KEY (`intId`),
KEY `chName` (`chName`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=9 ;
Now I am looking for a query which will do the following...
Want to list out the documents of the categories... in hierarchical order.
Category One
Documents of Category One
Sub Category - [ If any ]
Documents of Sub Category
Based on this I need to generate XML.

Answer 1

This page has a very good explanation and plenty of helpful examples on how to work with hierarchical data in MySQL. In your situation it's definitely worth the read:
http://mikehillyer.com/articles/managing-hierarchical-data-in-mysql/
...
Also make sure to follow the link to
There's also a reference to this page, with tips on how to work with hierarchical data in your database with a bit of help from PHP.