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ORA-01981 cascade constraints Tips

Oracle Database Tips by Donald BurlesonFebruary 5, 2015

I am getting the ORA-01981 error.  The table has a foreign key with a references keyword.


Answer:  The oerr utility shows this for the ORA-01981 error:


     ORA-01981 - CASCADE CONSTRAINTS must be specified to perform this revoke

     Cause: During this revoke some foreign key constraints will be removed. In order to perform this automatically, CASCADE CONSTRAINTS must be specified.

     Action: Remove the constraints or specify CASCADE CONSTRAINTS

Foreign key constraints help to enforce the types of relationships between tables we have just demonstrated. In this example we will create the ITEM and PART table. In the process of doing so, we will create a foreign key relationship between the two:

Part_desc VARCHAR2(200) NOT NULL );
Item_no NUMBER,
Part_no NUMBER,
Item_desc varchar2(200) NOT NULL,
CONSTRAINT fk_item_part FOREIGN KEY (part_no) REFERENCES PART (part_no),
CONSTRAINT pk_item PRIMARY KEY (item_no, part_no) );

Please read my notes on




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