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Editorial Team
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Asked: 2026-05-30T15:07:45+00:00

I get the following error message when I try to INSERT some data: SQLSTATE[23000]:

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I get the following error message when I try to INSERT some data:

SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or
update a child row: a foreign key constraint fails
(database/UserDetails, CONSTRAINT UserDetails_ibfk_6 FOREIGN
KEY (HearAboutID) REFERENCES UserDetails (HearAboutID) ON DELETE
CASCADE ON UPDATE CASCADE)

The FK relationship looks like this:

enter image description here

The data I’m trying to enter into UserDetails.HearAboutID is present in UserHearAbout.UserHearAboutID… so why won’t it go? 🙁

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1 Answer

  1. Editorial Team

    From the error you posted

    FOREIGN KEY (HearAboutID) REFERENCES UserDetails (HearAboutID) ON DELETE CASCADE ON UPDATE CASCADE)

    (you actually created a constraint that refers to the same table and same column),
    I guess that your FK constraint definition is wrong (it should be 

     FOREIGN KEY (HearAboutID) REFERENCES UserHearAbout (UserHearAboutID)
ON DELETE CASCADE ON UPDATE CASCADE)
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