Quote:
Originally Posted by Terisa de morgan
You're showing you're not a software developer. There's a very technical reason (which doesn't mean that is a good design). ISBN is a primary key in the table, so it cannot be duplicated.
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Another thing that could be done is to just change the cover to the current cover and forget this alternative entry. This alternative entry is just not needed. The book's entry should be up-to-date with the current version of that edition.
Also, the ISBN doesn't have to be a primary key.