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  1. #1
    Senior Coder
    Join Date
    Dec 2005
    Thanked 79 Times in 79 Posts

    add foreign constraint problem

    I manualy changed foregn key_name (as auto suggested by client) coz it was too long (mysql complaining)


    SQL Error (1452): Cannot add or update a child row: a foreign key constraint fails (`test`.<result 2 when explaining filename '#sql-a6c_4'>, CONSTRAINT `FK_t_hosts` FOREIGN KEY (`id_master`) REFERENCES `t` (`id`) ON )
    What does this mean ?

    I have 2 tables master-detail, where some master data does not have anything in detail.
    Last edited by BubikolRamios; 01-17-2014 at 02:01 AM.
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  2. #2
    God Emperor Fou-Lu's Avatar
    Join Date
    Sep 2002
    Saskatoon, Saskatchewan
    Thanked 2,668 Times in 2,637 Posts
    Its simply a violation.
    You cannot change/add a record since its missing its required foreign relation. Create the foreign relation first, then create the child record.

    Although if I understand your last sentence properly, than that indicates your constraints have been applied backwards and you are constraining the 1 side of the 1. . .n relation. You should be constraining the n side of the relation.
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