How to drop all user tables? - oracle

Question

How can I drop all user tables in oracle?
I have problem with constraints. When I disable all it is still no possible.

Answer 1

BEGIN
FOR cur_rec IN (SELECT object_name, object_type
FROM user_objects
WHERE object_type IN
('TABLE',
'VIEW',
'MATERIALIZED VIEW',
'PACKAGE',
'PROCEDURE',
'FUNCTION',
'SEQUENCE',
'SYNONYM',
'PACKAGE BODY'
))
LOOP
BEGIN
IF cur_rec.object_type = 'TABLE'
THEN
EXECUTE IMMEDIATE 'DROP '
|| cur_rec.object_type
|| ' "'
|| cur_rec.object_name
|| '" CASCADE CONSTRAINTS';
ELSE
EXECUTE IMMEDIATE 'DROP '
|| cur_rec.object_type
|| ' "'
|| cur_rec.object_name
|| '"';
END IF;
EXCEPTION
WHEN OTHERS
THEN
DBMS_OUTPUT.put_line ('FAILED: DROP '
|| cur_rec.object_type
|| ' "'
|| cur_rec.object_name
|| '"'
);
END;
END LOOP;
FOR cur_rec IN (SELECT *
FROM all_synonyms
WHERE table_owner IN (SELECT USER FROM dual))
LOOP
BEGIN
EXECUTE IMMEDIATE 'DROP PUBLIC SYNONYM ' || cur_rec.synonym_name;
END;
END LOOP;
END;
/

Answer 2

If you just want a really simple way to do this.. Heres a script I have used in the past
select 'drop table '||table_name||' cascade constraints;' from user_tables;
This will print out a series of drop commands for all tables in the schema. Spool the result of this query and execute it.
Source: https://forums.oracle.com/forums/thread.jspa?threadID=614090
Likewise if you want to clear more than tables you can edit the following to suit your needs
select 'drop '||object_type||' '|| object_name || ';' from user_objects where object_type in ('VIEW','PACKAGE','SEQUENCE', 'PROCEDURE', 'FUNCTION', 'INDEX')

Answer 3

Another answer that worked for me is (credit to http://snipt.net/Fotinakis/drop-all-tables-and-constraints-within-an-oracle-schema/)
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;
END;
Note that this works immediately after you run it. It does NOT produce a script that you need to paste somewhere (like other answers here). It runs directly on the DB.

Answer 4

begin
for i in (select 'drop table '||table_name||' cascade constraints' tbl from user_tables)
loop
execute immediate i.tbl;
end loop;
end;

Answer 5

The simplest way is to drop the user that owns the objects with the cascade command.
DROP USER username CASCADE

Answer 6

SELECT 'DROP TABLE "' || TABLE_NAME || '" CASCADE CONSTRAINTS;'
FROM user_tables;
user_tables is a system table which contains all the tables of the user
the SELECT clause will generate a DROP statement for every table
you can run the script

Answer 7

The easiest way would be to drop the tablespace then build the tablespace back up. But I'd rather not have to do that. This is similar to Henry's except that I just do a copy/paste on the resultset in my gui.
SELECT
'DROP'
,object_type
,object_name
,CASE(object_type)
WHEN 'TABLE' THEN 'CASCADE CONSTRAINTS;'
ELSE ';'
END
FROM user_objects
WHERE
object_type IN ('TABLE','VIEW','PACKAGE','PROCEDURE','FUNCTION','SEQUENCE')

Answer 8

To remove all objects in oracle :
1) Dynamic
DECLARE
CURSOR IX IS
SELECT * FROM ALL_OBJECTS WHERE OBJECT_TYPE ='TABLE'
AND OWNER='SCHEMA_NAME';
CURSOR IY IS
SELECT * FROM ALL_OBJECTS WHERE OBJECT_TYPE
IN ('SEQUENCE',
'PROCEDURE',
'PACKAGE',
'FUNCTION',
'VIEW') AND OWNER='SCHEMA_NAME';
CURSOR IZ IS
SELECT * FROM ALL_OBJECTS WHERE OBJECT_TYPE IN ('TYPE') AND OWNER='SCHEMA_NAME';
BEGIN
FOR X IN IX LOOP
EXECUTE IMMEDIATE('DROP '||X.OBJECT_TYPE||' SCHEMA_NAME.'||X.OBJECT_NAME|| ' CASCADE CONSTRAINT');
END LOOP;
FOR Y IN IY LOOP
EXECUTE IMMEDIATE('DROP '||Y.OBJECT_TYPE||' SCHEMA_NAME.'||Y.OBJECT_NAME);
END LOOP;
FOR Z IN IZ LOOP
EXECUTE IMMEDIATE('DROP '||Z.OBJECT_TYPE||' SCHEMA_NAME.'||Z.OBJECT_NAME||' FORCE ');
END LOOP;
END;
/
2)Static
SELECT 'DROP TABLE "' || TABLE_NAME || '" CASCADE CONSTRAINTS;' FROM user_tables
union ALL
select 'drop '||object_type||' '|| object_name || ';' from user_objects
where object_type in ('VIEW','PACKAGE','SEQUENCE', 'PROCEDURE', 'FUNCTION')
union ALL
SELECT 'drop '
||object_type
||' '
|| object_name
|| ' force;'
FROM user_objects
WHERE object_type IN ('TYPE');

Answer 9

Please follow the below steps.
begin
for i in (select 'drop table '||table_name||' cascade constraints' tb from user_tables)
loop
execute immediate i.tb;
end loop;
commit;
end;
purge RECYCLEBIN;