Don't be afraid of using your chosen database's command-line client. I might as well say this up front: I don't like using GUI (aka non-command-line or graphical) tools with my databases. This is ...

If you want to take a copy of one table and make a copy of it in another schema (under another username), you can use the SQL*Plus COPY command, or a simple <code>"create table foo as select * from ...