Quote:
Originally Posted by Krishnam Prabhu
Query:
I have e-books in my library with a few custom columns. One such custom column labeled as "Accession Number" so that to avoid duplications (i.e.) No e-book record should have the same Accession Number―An Unique Column.
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Due to the way the database works, Calibre already
has a unique ID for each book record. Just add {id} to a column-built-from-other-columns.