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Thread: refrential Integrity

  1. #1
    Join Date
    Feb 2006

    refrential Integrity

    i have put Foreign key constraint on my table with " on delete set null " option but when i am deleting the record in parent table it is giving me error - " can not update table.col to null ".

    ALTER TABLE binoy
    ADD ( FOREIGN KEY (deptno)
    REFERENCES deptno on delete set null)

    delete from deptno where deptno=10

    ERROR at line 1:
    ORA-01407: cannot update ("BINOY"."DEPTNO") to NULL

  2. #2
    Join Date
    Sep 2002
    is the column set to not null

  3. #3
    Join Date
    Feb 2006

    Referential Integrity

    it was not set to null when table was created untill i put foreign key constraint on the column...

  4. #4
    Join Date
    Mar 2007
    Ft. Lauderdale, FL
    please desc table
    Pablo (Paul) Berzukov

    Author of Understanding Database Administration available at amazon and other bookstores.

    Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.

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