Mysql query help - Alter this mysql query to get these results?
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Published on 2010-05-28T02:44:05Z
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2010/05/28
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Please execute the following queries first to set up so that you can help me:-
CREATE TABLE IF NOT EXISTS `Tutor_Details` (
`id_tutor` int(10) NOT NULL auto_increment,
`firstname` varchar(100) NOT NULL default '',
`surname` varchar(155) NOT NULL default '',
PRIMARY KEY (`id_tutor`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=41 ;
INSERT INTO `Tutor_Details` (`id_tutor`,`firstname`, `surname`) VALUES
(1, 'Sandeepan', 'Nath'),
(2, 'Bob', 'Cratchit');
CREATE TABLE IF NOT EXISTS `Classes` (
`id_class` int(10) unsigned NOT NULL auto_increment,
`id_tutor` int(10) unsigned NOT NULL default '0',
`class_name` varchar(255) default NULL,
PRIMARY KEY (`id_class`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=229 ;
INSERT INTO `Classes` (`id_class`,`class_name`, `id_tutor`) VALUES
(1, 'My Class', 1),
(2, 'Sandeepan Class', 2);
CREATE TABLE IF NOT EXISTS `Tags` (
`id_tag` int(10) unsigned NOT NULL auto_increment,
`tag` varchar(255) default NULL,
PRIMARY KEY (`id_tag`),
UNIQUE KEY `tag` (`tag`),
KEY `id_tag` (`id_tag`),
KEY `tag_2` (`tag`),
KEY `tag_3` (`tag`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=18 ;
INSERT INTO `Tags` (`id_tag`, `tag`) VALUES
(1, 'Bob'),
(6, 'Class'),
(2, 'Cratchit'),
(4, 'Nath'),
(3, 'Sandeepan'),
(5, 'My');
CREATE TABLE IF NOT EXISTS `Tutors_Tag_Relations` (
`id_tag` int(10) unsigned NOT NULL default '0',
`id_tutor` int(10) default NULL,
KEY `Tutors_Tag_Relations` (`id_tag`),
KEY `id_tutor` (`id_tutor`),
KEY `id_tag` (`id_tag`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO `Tutors_Tag_Relations` (`id_tag`, `id_tutor`) VALUES
(3, 1),
(4, 1),
(1, 2),
(2, 2);
CREATE TABLE IF NOT EXISTS `Class_Tag_Relations` (
`id_tag` int(10) unsigned NOT NULL default '0',
`id_class` int(10) default NULL,
`id_tutor` int(10) NOT NULL,
KEY `Class_Tag_Relations` (`id_tag`),
KEY `id_class` (`id_class`),
KEY `id_tag` (`id_tag`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO `Class_Tag_Relations` (`id_tag`, `id_class`, `id_tutor`) VALUES
(5, 1, 1),
(6, 1, 1),
(3, 2, 2),
(6, 2, 2);
- In the present system data which I have given , tutor named "Sandeepan Nath" has has created class named "My Class" and tutor named "Bob Cratchit" has created class named "Sandeepan Class".
Requirement -
To execute a single query with limit on the results to show search results as per AND logic on the search keywords like this:-
- If "Sandeepan Class" is searched , Tutor Sandeepan Nath's record from Tutor Details table is returned(because "Sandeepan" is the firstname of Sandeepan Nath and Class is present in class name of Sandeepan's class)
- If "Class" is searched Both the tutors from the Tutor_details table are fetched because Class is present in the name of the class created by both the tutors.
Following is what I have so far achieved (PHP Mysql):-
<?php
$searchTerm1 = "Sandeepan";
$searchTerm2 = "Class";
mysql_select_db("test");
$sql = "SELECT td.*
FROM Tutor_Details AS td
LEFT JOIN Tutors_Tag_Relations AS ttagrels ON td.id_tutor = ttagrels.id_tutor
LEFT JOIN Classes AS wc ON td.id_tutor = wc.id_tutor
LEFT JOIN Class_Tag_Relations AS wtagrels ON td.id_tutor = wtagrels.id_tutor
LEFT JOIN Tags as t1 on ((t1.id_tag = ttagrels.id_tag) OR (t1.id_tag = wtagrels.id_tag))
LEFT JOIN Tags as t2 on ((t2.id_tag = ttagrels.id_tag) OR (t2.id_tag = wtagrels.id_tag))
where t1.tag LIKE '%".$searchTerm1."%'
AND t2.tag LIKE '%".$searchTerm2."%'
GROUP BY td.id_tutor
LIMIT 10
";
$result = mysql_query($sql);
echo $sql;
if($result)
{
while($rec = mysql_fetch_object($result)) $recs[] = $rec;
//$rec = mysql_fetch_object($result);
echo "<br><br>";
if(is_array($recs))
{
foreach($recs as $each)
{
print_r($each);
echo "<br>";
}
}
}
?>
But the results are :-
If "Sandeepan Nath" is searched, it does not return any tutor (instead of only Sandeepan's row) If "Sandeepan Class" is searched, it returns Sandeepan's row (instead of Both tutors ) If "Bob Class" is searched, it correctly returns Bob's row If "Bob Cratchit" is searched, it does not return any tutor (instead of only
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