--delete tables
select 'drop table ' || table_name ||';'||chr(13)||chr(10) from user_tables;

--delete views
select 'drop view ' || view_name||';'||chr(13)||chr(10) from user_views;

--delete seqs
select 'drop sequence ' || sequence_name||';'||chr(13)||chr(10) from user_sequences;

--delete functions
select 'drop function ' || object_name||';'||chr(13)||chr(10) from user_objects where object_type='FUNCTION';

--delete procedure
select 'drop procedure ' || object_name||';'||chr(13)||chr(10) from user_objects where object_type='PROCEDURE';

--delete package
select 'drop package ' || object_name||';'||chr(13)||chr(10) from user_objects where object_type='PACKAGE';