php - Select all items Where cat_id= x or parent_id = x (Parent id different table)

Question

Hi as the title say i have a php code where i sucefully echo the articles in a table, the problem is in this table i just have cat_id the parent_id is referenced in other table..

"articulos" table

id | titulo | fecha_evento | descripcion | img | cat_id

"categoriablog" table

    id | parent_id 

This is the way im making my query

$query1 = "SELECT id,titulo,fecha_evento,descripcion,img FROM articulos WHERE cat_id = 1";
    $result = mysql_query($query1);

My goal is to do something like this, but "parent_id" is in other table

$query1 = "SELECT id,titulo,fecha_evento,descripcion,img FROM articulos WHERE cat_id = 1 OR parent_id = 1";
        $result = mysql_query($query1);