[Q] how to list all user's table content use dbms_metadata.get_ddl???

I tried to list all tables under user schema use
"dbms_metadata.get_ddl" but fail.  Does anyone know
how to do it?

SQL> select dbms_metadata.get_ddl( 'TABLE',,'USER1')
from dual;
select dbms_metadata.get_ddl( 'TABLE',,'USER1') from
dual
                                      *
ERROR at line 1:
ORA-00936: missing expression


Thanks.

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