I got the same warnings when I tried that query with 6.1b2. The warnings do not occur if I do the query with phpMyAdmin or with the mysql command on the server.
I think the problem is that the script is attempting to display the query results, but the CREATE query does not produce any results. "CREATE" probably needs to be added to the list of commands for which results are not displayed.
In admin/dbdocommand.php:
if (!preg_match("/DELETE|INSERT|UPDATE|REPLACE|ALTER/i",$command)) {
Reported as
bug.