通过下面语句可以得到要删除的所有表、索引、序列... 的语句

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

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

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

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

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

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

如果要是用PL/SQL工具查询的 直接把查询结果拷贝出来执行就行了。