Re: [Koha] Cleaning up lots of duplicates

If I could construct an SQL query to identify the duplicate biblionumbers (excluding an original record for each item), would it be enough to delete database records from the items, biblioitems, and biblios tables, and then fully re-index Zebra to clean these up?

Yes, it would be enough, if you don't have subscriptions or holdings linked to the deleted biblio records. Alternatively, you can build a query which produces a list of biblionumber, then use this list in Tools > Batch record deletion (no reindexing required). Kind regards, -- Frédéric DEMIANS http://www.tamil.fr/fdemians