how do i failed PHP

$query3 = "SELECT countedvaluerow count(*) as quantity FROM table WHERE row='value' GROUP BY column_name ORDER BY quantity DESC LIMIT 1";
$result3 = mysql_query($query3);
echo "$result3";

DELETE FROM threads WHERE thread_id = 1204615134;

mysql_query returns a resource, not a string. You can't echo it. You might be able to print_r it, though.

And you missed a comma in your query.