Home > #1452 - cannot add or update a child row: a foreign key constraint fails

How to fix `1452 - Cannot add or update a child row: a foreign key constraint fails`?

Published on April 12th, 2022

This error code happens when a foreign key constraint fails. This means that you are trying to add or update a child row, but the parent row does not exist. This can happen if you are trying to update a parent row that does not exist, or if you are trying to add a child row to a parent row that does not exist.

Other common searches for this error include:

  • error code 1452
  • mysql error code 1452
  • #1452 - cannot add or update a child row: a foreign key constraint fails

Some users might also have success with the following opitons:

  1. Remove the foreign key constraint
    1. Add a foreign key constraint
    1. Update the child row
    1. Delete the child row