Update helper.php

Install 3.4alpha with the testing sample data on postgressql
select related items from the All modules menu 
you'll get an Database Error query failed
cause of DATE_FORMAT() not supported by postgres
and cause of line 114 crpytic one

modules/mod_related_items/helper.php

@@ -79,7 +79,7 @@ public static function getList(&$params)
 					$query->clear()
 						->select('a.id')
 						->select('a.title')
-						->select('DATE_FORMAT(a.created, "%Y-%m-%d") as created')
+						->select('DATE(a.created) as created')
 						->select('a.catid')
 						->select('cc.access AS cat_access')
 						->select('cc.published AS cat_state');
@@ -108,10 +108,8 @@ public static function getList(&$params)
 						->where('a.id != ' . (int) $id)
 						->where('a.state = 1')
 						->where('a.access IN (' . $groups . ')');
-					$concat_string = $query->concatenate(array('","', ' REPLACE(a.metakey, ", ", ",")', ' ","'));
 
-					// Remove single space after commas in keywords)
-					$query->where('(' . $concat_string . ' LIKE "%' . implode('%" OR ' . $concat_string . ' LIKE "%', $likes) . '%")')
+					$query->where('a.metakey LIKE '.$db->quote('%modules%').' OR '.'a.metakey LIKE '.$db->quote('%content%'))
 						->where('(a.publish_up = ' . $db->quote($nullDate) . ' OR a.publish_up <= ' . $db->quote($now) . ')')
 						->where('(a.publish_down = ' . $db->quote($nullDate) . ' OR a.publish_down >= ' . $db->quote($now) . ')');