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Editorial Team
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Asked: 2026-06-12T20:37:52+00:00

On other two tables, I have set foreign to d_desavanja->id field, but on this

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On other two tables, I have set foreign to d_desavanja->id field, but on this table, I can’t.

How can I make it works?

SQL query:

ALTER TABLE  `d_des_kat` ADD FOREIGN KEY (  `desavanje_id` ) REFERENCES  `desavanja`.`d_desavanja` (

`id`
) ON DELETE CASCADE ON UPDATE CASCADE ;

MySQL said: 

#1452 - Cannot add or update a child row: a foreign key constraint fails (`desavanja/#sql-12f3_5af2e`, CONSTRAINT `#sql-12f3_5af2e_ibfk_1` FOREIGN KEY (`desavanje_id`) REFERENCES `d_desavanja` (`id`) ON DELETE CASCADE ON UPDATE CASCADE)
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1 Answer

  1. Editorial Team

    You’ve got a row in d_des_kat that fails the constraint. Check your data to make sure that all non-NULL d_des_kat.desavanje_id values match an existing id in d_desavanja.

    The following query should show you the offending rows:

    SELECT *
FROM d_des_kat
WHERE desavanje_id NOT IN (SELECT id FROM d_desavanja)
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