Question

I can’t get my NOT EXISTS mysql statement to work and it’s driving me mad now:

$ancestors = mysql_query('
    SELECT * FROM comments e
        WHERE 
            ancestors = "' . $comment["id"] . '" AND 
            user_id != "' . $user->user_object["id"] . '" AND
                NOT EXISTS
                    (
                        SELECT  null 
                        FROM    notifications d
                        WHERE   d.target_id = e.id
                    )
', $database->connection_handle);

Any ideas?

ERROR:

Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in /<>/<>/functions.php on line 785
Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in /<>/<>/functions.php on line 785
Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in /<>/<>/functions.php on line 785
Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in /<>/<>/functions.php on line 785
Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in /<>/<>/functions.php on line 785
Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in /<>/<>/functions.php on line 785
Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in /<>/<>/functions.php on line 785
Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in /<>/<>/functions.php on line 785
Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in /<>/<>/functions.php on line 785

Line 785:

    while($reply = mysql_fetch_array($ancestors, MYSQL_ASSOC)){

If I do this:

$ancestors = mysql_query('SELECT * FROM ' . $database->db_prefix . 'comments 
    WHERE    
        ancestors = "' . $comment["id"] . '" AND 
        user_id != "' . $user->user_object["id"] . '"', 
        $database->connection_handle
);

It returns my results i expect.

the notifications table does contain an entry

mysql var dump =

string(46) "Table 'whatever_co.comments' doesn't exist"

//SOLVED:::
‘ . $database->db_prefix . ‘ was missing from my table selectors.

Answer 1

I was missing my table prefix: ‘ . $database->db_prefix . ‘ from comments and notifications. The reason for the question was its the first time i have used not exists.. and was assuming that was the part that was incorrect. Thanks for all your time. This causes for celebration.