how do i add a conditional to a query?

[Antivirus]

lol, the AND shoudl have been a WHERE (oops)

PHP Code:

    if ($_GET['contenttypeid'])
    {
        $querycontents = $db->query_read("
                        SELECT erc_content.*, erc_contenttype.contenttype
                        FROM erc_content
                        LEFT JOIN erc_contenttype ON erc_content.contentid = erc_contenttype.contenttypeid
                        WHERE erc_content.contenttypeid = '".$_GET['contenttypeid']."'
                        ORDER BY erc_contenttype.displayorder, erc_content.displayorder
                        ");
    }    
    else
    {
        $querycontents = $db->query_read("
                        SELECT erc_content.*, erc_contenttype.contenttype
                        FROM erc_content
                        LEFT JOIN erc_contenttype ON erc_content.contentid = erc_contenttype.contenttypeid
                        ORDER BY erc_contenttype.displayorder, erc_content.displayorder
                        ");
    } 


As far as cleaning the $_GET thing, and the table prefixes, that's my next thing to get working... will post completed when i finish it. Thanks Alan!

Paul, i am going to try to do what you said, but I am a little confused, didn't i already build the query as the variable $querycontents?