[BetterRed]

Originally Posted by kovidgoyal

The calibre database is normalised. So author values are not stored directly on book records, instead there is a separate authors table and a link table to join it with the books table. Unknown authors are never stored in the authors table as far as I remember.

@kovid - FWIW the "Unknown" author is stored in the authors table:



And the books_author_table associates books with the "Unknown" author



It's also in the author_sort column of the books table


In case I'd done something strange with my Test library, I also checked my Books library - it's the same.

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BR