How to display database object DDL...

I am used to working with Teradata and on that database you can
use the command show table <tablename> and it will display the
DDL that was used to create that table. I know of the describe
command used on Oracle via SQLPLUS. But the describe command
doesn't show the DDL. Is there some command that will show me
the DDL statement that was used to create the table, user, etc...

No i dont know one but if you have sql*navigator, just right-
click on the table and choose 'extract ddl' in the popup menu.
Hope this helps,
Roger.

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