The ratio PRIMARYis equal fk_student_single_user1., therefore I must remove one of them.
The problem is that I cannot delete or rename PRIMARYto workbench, the program does not allow, and if I delete fk_student_single_user1, I will also delete foreign key. The only way is to remove PRIMARYin phpmyadmin.
But I think that there is some problem in my eer model, it is supposed to export without errors. I deleted my previous column id because two foreign keys can be the main key of the table.
How can i solve this?
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