how to join Between four tables on mysql - mysql

Question

i have 4 tables for mysql database, how i join Between them
users:
userid|username
1 | mark
2 | jon
awards_user :
awardid|userid
1 |1
2 |2
cat :
catid|catname
1 | english
2 | computer
awards :
awardid|catid|awardname|awardlink
1 |1 |best1 |pic link
2 |2 |best2 |pic link
resulte :
userid|username|catid|catname|awardid|awardname|awardlink
okay , that is my try :
works but Shows only one result, when there is a member holds a award
، I want to show all the awards, even if there is no one holds them .
$all_awards = $db->query_read(" SELECT * FROM " . TABLE_PREFIX . " users,awards_user,cat,awards
WHERE
awards_user.awardid = awards.awardid
AND
awards_user.userid = users.userid
AND
awards.catid = cat.catid
");
CREATE TABLE `awards` (
`id` int(10) unsigned NOT NULL auto_increment,
`forumid` int(10) unsigned NOT NULL,
`name` varchar(100) NOT NULL default '',
`link` varchar(100) NOT NULL default '',
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=2 ;
--
-- Dumping data for table `awards`
--
INSERT INTO `awards` VALUES (1, 2, 'award one', 'http://www.mwadah.com/pict/noway9.gif');
INSERT INTO `awards` VALUES (2, 1, 'award 2', 'http://www.forum-ksa.com/up/uploads/images/forum-ksac59a7122d1.gif');
-- --------------------------------------------------------
--
-- Table structure for table `awards_user`
--
CREATE TABLE `awards_user` (
`id` int(10) unsigned NOT NULL auto_increment,
`awardid` int(10) unsigned NOT NULL,
`userid` int(10) unsigned NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=3 ;
--
-- Dumping data for table `awards_user`
--
INSERT INTO `awards_user` VALUES (2, 2, 2);
-- --------------------------------------------------------
--
-- Table structure for table `forum`
--
CREATE TABLE `forum` (
`forumid` smallint(5) unsigned NOT NULL auto_increment,
`title` varchar(100) NOT NULL default '',
PRIMARY KEY (`forumid`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=2;
--
-- Dumping data for table `forum`
--
INSERT INTO `forum` VALUES (1,'Main Category');
INSERT INTO `forum` VALUES (2,'Main Forum');
-- --------------------------------------------------------
--
-- Table structure for table `user`
--
CREATE TABLE `user` (
`userid` int(10) unsigned NOT NULL auto_increment,
`username` varchar(100) NOT NULL default ''
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=3 ;
--
-- Dumping data for table `user`
--
INSERT INTO `user` VALUES (1,'admin');
INSERT INTO `user` VALUES (1,'mark');

Answer 1

You could structure your JOIN query like this:
SELECT *
FROM users
JOIN awards_user USING(userid)
JOIN awards USING(awardid)
JOIN cat USING(catid)
Then you can add a WHERE clause to filter the result.

Answer 2

SELECT awards.userid,
username,
awards.catid,
catname,
awards.awardid,
awardname,
awardlink
FROM users,
awards_user,
cat,
awards
WHERE awards_user.userid = users.userid
AND awards_user.awardid = awards.awardid
AND cat.catid = awards.catid;