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  1. #1
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    add constraint gives:ERROR 1452 (23000): Cannot add or update a child row???

    i have the following:

    mysql> show create table rc_profile_table \G;
    *************************** 1. row ***************************
    Table: rc_profile_table
    Create Table: CREATE TABLE `rc_profile_table` (
    `id` int(11) NOT NULL auto_increment,
    `created_at` datetime default NULL,
    `name` varchar(32) NOT NULL,
    `surname` varchar(32) NOT NULL,
    `password` varchar(128) NOT NULL,
    `unique_code` varchar(16) NOT NULL,
    `msisdn` varchar(32) NOT NULL,
    `current_location` varchar(64) NOT NULL,
    `profile_pic` varchar(255) default NULL,
    `email` varchar(128) NOT NULL,
    `age` int(11) NOT NULL,
    `city_of_birth` varchar(64) NOT NULL,
    `personality` varchar(128) NOT NULL,
    `country_id` int(11) NOT NULL,
    `religious_id` int(11) NOT NULL,
    `relationship_id` int(11) NOT NULL,
    `wants_and_needs` varchar(512) default NULL,
    `hopes_and_aspirations` varchar(512) default NULL,
    `profession` varchar(128) default NULL,
    `hobbies_and_interests` varchar(512) default NULL,
    `skills_and_talents` varchar(512) default NULL,
    `open_comment` varchar(512) default NULL,
    `food_and_drinks` varchar(512) default NULL,
    `activated` int(11) default NULL,
    `mood_updated_at` datetime default NULL,
    `mood_color` varchar(32) default NULL,
    `mood_desc` varchar(64) default NULL,
    `login_count` int(10) unsigned default '0',
    `campus_id` int(11) default NULL,
    PRIMARY KEY (`id`),
    KEY `rc_profile_table_FI_2` (`country_id`),
    KEY `rc_profile_table_FI_3` (`religious_id`),
    KEY `rc_profile_table_FI_4` (`relationship_id`),
    KEY `rc_profile_table_FI_5` (`campus_id`),
    CONSTRAINT `rc_profile_table_FK_2` FOREIGN KEY (`country_id`) REFERENCES `rc_country_table` (`id`) ON DELETE CASCADE,
    CONSTRAINT `rc_profile_table_FK_3` FOREIGN KEY (`religious_id`) REFERENCES `rc_religious_type_table` (`id`) ON DELETE CASCADE,
    CONSTRAINT `rc_profile_table_FK_4` FOREIGN KEY (`relationship_id`) REFERENCES `rc_relationship_type_table` (`id`) ON DELETE CASCADE,
    CONSTRAINT `rc_profile_table_FK_5` FOREIGN KEY (`campus_id`) REFERENCES `rc_campus_table` (`id`) ON DELETE CASCADE
    ) ENGINE=InnoDB AUTO_INCREMENT=159 DEFAULT CHARSET=utf8
    1 row in set (0.01 sec)

    and also:

    mysql> show create table rc_sent_items_table \G;
    *************************** 1. row ***************************
    Table: rc_sent_items_table
    Create Table: CREATE TABLE `rc_sent_items_table` (
    `profile_id_from` int(11) NOT NULL,
    `profile_id_to` int(11) NOT NULL,
    `message` varchar(512) default NULL,
    `subject` varchar(255) default NULL,
    `opened_once` int(11) default NULL,
    `message_type_id` int(11) default NULL,
    `id` int(11) NOT NULL auto_increment,
    `created_at` datetime default NULL,
    PRIMARY KEY (`id`),
    KEY `rc_sent_items_table_FI_1` (`profile_id_from`),
    KEY `rc_sent_items_table_FI_2` (`profile_id_to`),
    KEY `rc_sent_items_table_FI_3` (`message_type_id`),
    CONSTRAINT `rc_sent_items_table_FK_3` FOREIGN KEY (`message_type_id`) REFERENCES `rc_message_type_table` (`id`) ON DELETE CASCADE
    ) ENGINE=InnoDB AUTO_INCREMENT=159 DEFAULT CHARSET=utf8
    1 row in set (0.00 sec)

    so when i try to do:
    ALTER TABLE rc_sent_items_table ADD CONSTRAINT `rc_sent_items_table_FK_1` FOREIGN KEY (`profile_id_to`) REFERENCES `rc_profile_table` (`id`) ON DELETE CASCADE;

    i get this error:

    ERROR 1452 (23000): Cannot add or update a child row: a foreign key constraint fails (`traffic2/#sql-1122_5cf`, CONSTRAINT `rc_sent_items_table_FK_1` FOREIGN KEY (`profile_id_to`) REFERENCES `rc_profile_table` (`id`) ON DELETE CASCADE)

    what am i doing wrong please?
    thank you
    Last edited by helloise; 06-27-2011 at 04:18 PM. Reason: more info

  • #2
    UE Antagonizer Fumigator's Avatar
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    The error is telling you the data in your tables does not comply with the constraint you're attempting to add.


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