Error 1452: Cannot add or update a child row: a foreign key constraint fails. September 11, 2014 06:19 Updated The error 1452 occurs only in a trial version of the DBSync for MS Access and MySQL. The software is unable to build the accurate structure of foreign keys because of 50 first records limitation. Related articles Your program tries to process the non-existent queries in my database. How can I overcome this? What does Run-time error '3044' mean? Comments 0 comments Please sign in to leave a comment.