select 'drop table ' || table_name ||'cascade constraints;'||chr(13)||chr(10) from user_tables; --delete tables
select 'drop view ' || view_name||' cascade constraints;'||chr(13)||chr(10) from user_views; --delete views
select 'drop sequence ' || sequence_name||' cascade constraints;'||chr(13)||chr(10) from user_sequences;--delete seqs
select 'drop function ' || object_name||' cascade constraints;'||chr(13)||chr(10) from user_objects where object_type='FUNCTION';--delete functions
select 'drop procedure ' || object_name||' cascade constraints;'||chr(13)||chr(10) from
user_objects where object_type='PROCEDURE';--DELETE PROCEDURE
select 'drop package ' || object_name||' cascade constraints;'||chr(13)||chr(10) from user_objects where object_type='PACKAGE';--delete pags