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Thread: refrential Integrity

  1. 03-17-2010, 01:37 AM #1
    binoyshil
    binoyshil is offline Junior Member
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    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
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  2. 03-17-2010, 03:56 AM #2
    davey23uk
    davey23uk is offline Senior Advisor
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    is the column set to not null
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  3. 03-17-2010, 04:24 AM #3
    binoyshil
    binoyshil is offline Junior Member
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    Referential Integrity

    it was not set to null when table was created untill i put foreign key constraint on the column...
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  4. 03-17-2010, 07:51 AM #4
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    PAVB
    PAVB is offline Senior Advisor
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    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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