BEGIN
FOR c IN (SELECT table_name FROM user_tables) LOOP
EXECUTE IMMEDIATE ('DROP TABLE "' || c.table_name || '" CASCADE CONSTRAINTS');
END LOOP;
FOR s IN (SELECT sequence_name FROM user_sequences) LOOP
EXECUTE IMMEDIATE ('DROP SEQUENCE ' || s.sequence_name);
END LOOP;
FOR i IN (SELECT view_name FROM user_views) LOOP
EXECUTE IMMEDIATE 'DROP VIEW ' || i.view_name;
END LOOP;
END;
* คำสั่งนี้ จะทำงานทันที ให้ระวังในการใช้งาน
