Aaron Jefferson Villanueva's Blog Site» MySql Join query http://malebolgia.shadowsonawall.net Programming / Designing Blogging from windows to mac. Fri, 20 May 2011 12:05:55 +0000 http://wordpress.org/?v=2.9.2 en hourly 1 Right way to use sql… http://malebolgia.shadowsonawall.net/code-programming/right-way-to-use-sql-join-with-conditions-displaying-no-match-data.html http://malebolgia.shadowsonawall.net/code-programming/right-way-to-use-sql-join-with-conditions-displaying-no-match-data.html#comments Tue, 03 Mar 2009 07:27:20 +0000 admin http://malebolgia.shadowsonawall.net/?p=55 Right way to use sql join with conditions (Displaying no match data).
After hours trying to figure out what's wrong with my query for displaying list of cities with how many Lease/Sale were there. The problem was getting the cities even not yet added on Lease or Sale type, that means I need to list cities that has no match yet or 0 count. 

1
2
3
4
5
6
7
8
9
10
11
12
13
14

<?
global $mainframe;
$ebconfig = &$mainframe->getParams();
$prop_Type = $ebconfig->get('prop_type', "Lease");
 
 
$db_city =& JFactory::getDBO();
$query_city = "SELECT t1.city, t1.id, COUNT( t2.propCity ) AS city_count
FROM #__listing_city AS t1
LEFT OUTER JOIN #__listing_listings AS t2 ON t2.propCity = t1.city
WHERE t2.propType = '$prop_Type' AND t2.published = 1
GROUP BY t1.city
ORDER BY t1.city ASC";
?>


The code above does not display the cities that has no match on another table. The where clause was giving the problem... 
1
2
3
4
5
6
7
8
9
10
11
12
13
14

<?
global $mainframe;
$ebconfig = &$mainframe->getParams();
$prop_Type = $ebconfig->get('prop_type', "Lease");
 
 
$db_city =& JFactory::getDBO();
$query_city = "SELECT t1.city, t1.id, COUNT( t2.propCity ) AS city_count
FROM #__listing_city AS t1
LEFT OUTER JOIN #__listing_listings AS t2 ON t2.propCity = t1.city
AND t2.published = 1 AND t2.propType = '$prop_Type'
GROUP BY t1.city
ORDER BY t1.city ASC";
?>


Instead putting the condition on "ON Clause" after the matching table condition, fixed the problem.]]> http://malebolgia.shadowsonawall.net/code-programming/right-way-to-use-sql-join-with-conditions-displaying-no-match-data.html/feed 0