MySQL Error 1215: Cannot add foreign key constraint

Question

I am trying to forward engineer my new schema onto my db server, but I can\'t figure out why I am getting this error. I\'ve tried to search for the answer here, but everyth

Answer 1

This also happens when the type of the columns is not the same.

e.g. if the column you are referring to is UNSIGNED INT and the column being referred is INT then you get this error.