There are no primary or candidate keys in the referenced table that match the referencing column list in the foreign key

Question

In SQL Server , I got this error ->

\"There are no primary or candidate keys in the referenced table \'BookTitle\' that match the referencing colum

Answer 1

You need either

• A unique index on Title in BookTitle
• An ISBN column in BookCopy and the FK is on both columns

A foreign key needs to uniquely identify the parent row: you currently have no way to do that because Title is not unique.