Join
$sql = 'SELECT * FROM items
JOIN files ON files.id = items.files_id WHERE approved is NOT NULL';
$rows = R::getAll($sql);
Find all
$items = R::find('items', 'approved is NOT NULL');
FindLike
$obj = [
'accounts_id' => Account_v0::$loggedIN['id'],
'content_id' => $_REQUEST['content_id'],
'content_types_id' => $_REQUEST['content_types_id'],
];
$ratings = R::findLike('ratings', $obj);