Selecting information from 2 tables in 1 sql statement PDO

[edit] i believe ive posted this in the wrong section D: please could a mod delete or move it! thanks!

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Hi

Im trying to get :

 - title, newstext, authorId from indexNews

 - id, forename, surname from users

where authorId is id 

im using pdo, which is where im stuck

here is what I've done so far :

	try {

		$sql = "SELECT i.title, i.newstext, i.authorId, u.id, u.forename, u.surname FROM indexNews as i JOIN users AS u ON (i.authorId = u.id)";
		
		
		//$sql = "SELECT * FROM indexNews";
		foreach ($db->query($sql) as $row) {
			echo '<div class="announceTitle">';
			echo $row['i.title'] .' - '. $row['i.authorId'] . '<br />';
			echo $row['u.surname'].' '.$row['u.forename'].'<br />';
			echo '</div>
				<div class="announceText">';
			echo $row['i.newstext'];
			echo '</div>
				<br />
				<br />';
		}
		
	}
	catch(PDOException $e) {
		echo $e->getMessage();
	}

when i run this i get :

Notice: Undefined index: i.title in <document path>/index.php on line 100

Notice: Undefined index: i.authorId in <document path>/index.php on line 100

line 100 is 

echo $row['i.title'] .' - '. $row['i.authorId'] . '<br />';
 

i think that the issue might be with the array? but i'm not sure.

I've tried googling and have been looking for a tutorial, but haven't found an answer.

could anyone give me some hints as to where i'm going wrong? 

Thanks for your time