Reflecting sub records in PHP from MySQL - php

Question

I am trying to get records from my DB using 2 seperate tables. The query is
public function get_pages_by_campign_id($campaignID) {
$campaignID = $this->real_escape_string($campaignID);
return $this->query("SELECT pid, campaignid FROM pages,campaigns WHERE 'pages.campaignid = campaigns.id'");
}
And this is called into play by :
$counter = 1;
$userID = PageDB::getInstance()->get_user_id_by_name($_SESSION['user']);
$result = PageDB::getInstance()->get_pages_by_campaign_id($campaignID);
$i=0;
while ($row = mysqli_fetch_array($result)):
$style = "";
if($i%2==0)
{
$style = ' style="background-color: #EFEFEF"';
}
echo "<tr".$style.">";
echo "<td style='width:140px;'> Page " . $counter . "</td>";
echo "<td> </td>";
echo "<td></td>";
//The loop is left open
?>
<td>
<form style="display:none;"></form>
<form name="editPage" action="editPage.php" method="GET">
<input type="hidden" name="pageID" value="<?php echo $pageID = $row['pid']; ?>"/>
<input type="submit" name="editPage" value="Edit"/>
</form>
</td>
<td>
<form name="deletePage" action="deletePage.php" method="POST">
<input type="hidden" name="pageID" value="<?php echo $pageID = $row['pid']?>"/>
<input type="submit" name="deletePage" value="Delete" onclick = "javascript: return confirm('Delete Page <?php echo $counter ?> ?');"/>
</form>
</td>
<?php
$pageID = $row['pid'];
$counter++;
$i++;
echo "</tr>\n";
endwhile;
mysqli_free_result($result);
?>
This should list all "page" Records, but it is returning nothing.
I have set up the "id" column in table "campaigns" to correspond with "campaignid" in table "pages" using foreign keys.
I manged to fix it with this :
public function get_pages_by_campaign_id($campaignID) {
$campaignID = $this->real_escape_string($campaignID);
return $this->query("SELECT pid, campaignid FROM pages WHERE campaignid = 'campaigns.id'");
}

Answer 1

"SELECT pid, campaignid FROM pages,campaigns WHERE pages.campaignid = campaigns.id"
?