How to fix ORA 02449?

This error commonly occurs when you have a parent-child relationship established between two tables through a foreign key. You then have tried to drop the parent table without removing the foreign key. To correct this problem, you need to drop the foreign key first and then you can drop the parent table.

How do I force a table to drop in Oracle?

If you’re really sure you want to drop the table even though it’s referenced in foreign keys you can force it like this: drop table state cascade constraints; This syntax is defined in the Oracle SQL Reference. Note that this drops any foreign key relationships.

How do you drop a foreign key?

Dropping foreign keys

To drop foreign keys using the Control Center: Expand the object tree until you see the Tables folder. Right-click the table you want to modify, and select Alter from the pop-up menu.
To drop foreign keys using the command line, enter: ALTER TABLE name DROP FOREIGN KEY foreign_key_name.

What does drop table cascade constraints do?

Specify CASCADE CONSTRAINTS to drop all referential integrity constraints that refer to primary and unique keys in the dropped table. If you omit this clause, and such referential integrity constraints exist, then the database returns an error and does not drop the table.

What is Oracle Cascade?

A foreign key with cascade delete means that if a record in the parent table is deleted, then the corresponding records in the child table will automatically be deleted. This is called a cascade delete in Oracle.

What is Purge command in Oracle?

When issuing a DROP TABLE statement in Oracle, you can specify the PURGE option. The PURGE option will purge the table and its dependent objects so that they do not appear in the recycle bin. The risk of specifying the PURGE option is that you will not be able to recover the table.

How do I drop a constraint in Oracle?

Drop Unique Constraint The syntax for dropping a unique constraint in Oracle is: ALTER TABLE table_name DROP CONSTRAINT constraint_name; table_name.

Which statement should you use to remove a foreign key?

Once a foreign key has been created, you may find that you wish to drop the foreign key from the table. You can do this with the ALTER TABLE statement in SQL Server (Transact-SQL).

Can a primary key be a foreign key?

Yes, it is legal to have a primary key being a foreign key. This is a rare construct, but it applies for: a 1:1 relation. The two tables cannot be merged in one because of different permissions and privileges only apply at table level (as of 2017, such a database would be odd).

What happens to index when table is dropped Oracle?

Dropping a table removes the table definition from the data dictionary. All indexes and triggers associated with a table are dropped. All views and PL/SQL program units dependent on a dropped table remain, yet become invalid (not usable).

What is purge in hive?

Hive will remove all of its data and metadata from the hive meta-store. The hive DROP TABLE statement comes with a PURGE option. In case if the PURGE option is mentioned the data will be completely lost and cannot be recovered later but if not mentioned then data will move to . Trash/current directory.

How to fix ORA 02449?