[PHP-DB] A JOIN that works sometimes ?

[Christine Clerc]

Could anyone please help me with that query ?

$req="SELECT * FROM tab AS C INNER JOIN inter AS A ON 
C.id_tab=A.id_tab WHERE A.id_cat IS NULL OR A.id_cat = 0 ORDER BY 
num";
$result = mysql_query ($req,$db);

It works on my machine but not on the server.

Christine