When upgrading MySQL 8.0.13 from 5.7, a problem occurs if any of the
foreign key restraints contains a primary key with one or more capital
letters in it. MySQL converts any capital letters to lower case in the
foreign key restraint while still recognizing the primary key with its
capital.
For example: the primary key is Primary_id and its foreign key is
foreign_id. In practice, the restraint links these two fields:
primary_id and foreign_id respectively. Since primary_id contains no
data, the related tables can not be used in a query.
A warning of some type should be made stating that primary keys are not
to have any capital letters in it.
Dan
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