Get notifications from database - php

Question

im making an notification system, and i can't get them outputted.
I have following code:
public function getNotification() {
$sth = $this->dbh->prepare("SELECT n.to_uid as `notif_to_uid`, n.status as `notif_status`, n.time as `notif_time`, u.id as `user_id`, u.name as `user_name` FROM notifications n INNER JOIN users u ON u.id = n.to_uid WHERE u.id = :uid n.type = 'friendrequest'");
$sth->execute(array(
':uid' => $_SESSION['uid']
)
);
if($notifications = $sth->fetchAll(PDO::FETCH_OBJ)) {
foreach($notifications as $notification) {
echo 'New notification ect. ect.';
}
}
}
My tables looks like this:
CREATE TABLE `notifications` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`from_uid` int(11) NOT NULL,
`to_uid` int(11) NOT NULL,
`type` enum('friendrequest','gameinvite','update') NOT NULL,
`status` enum('unseen','seen') NOT NULL,
`time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
PRIMARY KEY (`id`)
);
CREATE TABLE `users` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`email` varchar(255) NOT NULL,
`password` varchar(155) NOT NULL,
`firstname` varchar(255) NOT NULL,
`lastname` varchar(255) NOT NULL,
`gender` varchar(255) NOT NULL,
`points` varchar(255) DEFAULT '0',
PRIMARY KEY (`id`)
);
Right now it isnt outputting anything, and the connection to the db does work.

Answer 1

Try to display query errors by
$execute = $sth->execute(array(
':uid' => $_SESSION['uid']
)
);
if(!$execute){
print_r($sth->errorInfo());
}
I see you have lost "AND" or "OR" here
WHERE u.id = :uid n.type = 'friendrequest'