[mysql] Mysql error 1452 - Cannot add or update a child row: a foreign key constraint fails

Truncate the tables and then try adding the FK Constraint.

I know this solution is a bit awkward but it does work 100%. But I agree that this is not an ideal solution to deal with problem, but I hope it helps.

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ERROR 1452: Cannot add or update a child row: a foreign key constraint fails MySQL - Cannot add or update a child row: a foreign key constraint fails Mysql error 1452 - Cannot add or update a child row: a foreign key constraint fails