Question

I have this php query;

$sql = "SELECT * 
        FROM store AS s 
        LEFT JOIN setting as set ON (s.store_id = set.store_id)";
$sql .= " WHERE (set.key = 'config_template' OR set.key IS NULL)";    
$sql .= " ORDER BY url";

$query = $this->db->query($sql);

What i would like to do is return all rows where key is equal to “config_template”. But if there are no keys that match “config_template”, I still want to return that row except the column key would be empty.

I thought about using NOT IN or NOT EXIST but I am not sure how to use these in this circumstance?

Answer 1

Moving the condition for the key into the JOIN condition should do the trick:

SELECT * 
FROM store AS s 
  LEFT JOIN setting as set 
         ON s.store_id = set.store_id AND set.key = 'config_template'
ORDER BY url