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 What does Run-time error '3044' mean? Autodetection of potential migration issues. Errors and Warnings Your program tries to process the non-existent queries in my database. How can I overcome this? Getting started Can I convert primary keys, foreign keys and indexes? Comments 0 comments Please sign in to leave a comment.