Generate script to delete all schemas

Hello All,
I'm going to do a reimport and i want to delete all the schemas in the db....
I've written this script:
select 'DROP TABLE schemaname.' || TABLE_NAME || ' CASCADE CONSTRAINTS;'
from dba_tables
where owner = 'schemaname'
order by TABLE_NAME;
how can i generate the script for all the schemas? The above will only list one schema...
Basically i want to do another import and get a clean log (as clean as possible).
Thanks.

You modify your query to select a distinct list of object owners. In fact you might want to look for some other objects besides tables. If you are only interested in tables you should probably change the subquery to look at dba_tables.
select 'DROP TABLE '||owner||'.' || TABLE_NAME || ' CASCADE CONSTRAINTS;'
from dba_tables
where owner in (select distinct owner from dba_objects
where owner not in ('SYS','SYSTEM','OUTLN','PUBLIC')
order by TABLE_NAME;
You should look the list of owners over very carefully before running the resulting DDL commands. There are other owners, depending on your Oracle version and features in use, that you will not want to touch.
HTH -- Mark D Powell --

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