I know this is an old message, but have you gotten things working? First of all, V3 of the SQL toolbox is very out of date. Running under windows you don't really need a toolbox at all thanks to the built-in ADO.
Second, the first of your two statements is malformed. There's no tablename. You can't put a subquery where you're trying to use it. Think about it, the subquery has no where clause so it will return multiple ename values. So what is the "outer" select supposed to do, return all the data from all those tables? If so, what happens when the tables have different contents? How is the dbms supposed to format the output?
Mike...