Excerpts from David Sale's message of 2020-07-31 19:12:13 +0000:
However, adding "b.isbn" to the SELECT list (as with "b.title", "b.author", etc.) breaks the report and renders it non-functional.
You might find this page useful, since it does provide some isbn examples: https://wiki.koha-community.org/wiki/SQL_Reports_Library The problem with your query is that isbn is not a field in the biblios table; it is in the biblioitems table. You'll need to join that table to the query, perhaps like the one below. SELECT bi.isbn, i.itemcallnumber, b.biblionumber, b.title, b.author, b.copyrightdate, i.barcode, i.datelastseen, i.issues AS totalcheckouts, i.dateaccessioned FROM items i LEFT JOIN issues USING (itemnumber) LEFT JOIN biblio b USING (biblionumber) LEFT JOIN biblioitems bi USING (biblionumber) WHERE homebranch = <<Home Library|branches>> AND location = <<Shelving location|LOC>> AND i.withdrawn=0 AND i.itemlost=0 AND i.damaged=0 AND i.itemnumber NOT IN (SELECT issues.itemnumber FROM issues) AND YEAR(NOW())-YEAR(i.datelastseen) > <<Years NOT seen>> ORDER BY i.itemcallnumber ASC