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

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
2. 2. Add a foreign key constraint
3. 3. Update the child row
4. 4. Delete the child row