SQL & PL/SQL

Hello everybody,

I have a quick question. I need to execute a query on different databases and I have to build the connection string dynamically. unfortunately, this doesn't work

{code}

SELECT * FROM dual@('(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=server)(PORT=1291))(CONNECT_DATA=(SID=MYDB)))');

{code}

Any idea on how I can do this? I'm using Oracle 11.2.

Thank you,