--- /dev/null
+create temporary table callnumbers ( callnumber varchar(255) primary key, count int not null ) ;
+insert into callnumbers select itemcallnumber,count(*) from items where itemcallnumber like 'D%' group by itemcallnumber ;
+
+-- Duple signature
+SELECT count(*) as primjeraka,
+ callnumbers.count as signatura,
+ items.itemcallnumber,
+ biblio.author,biblio.title,biblioitems.publicationyear,biblioitems.volume,biblio.biblionumber
+FROM items
+LEFT JOIN biblioitems on (items.biblioitemnumber=biblioitems.biblioitemnumber)
+LEFT JOIN biblio on (biblioitems.biblionumber=biblio.biblionumber)
+LEFT JOIN callnumbers on (items.itemcallnumber=callnumbers.callnumber)
+WHERE items.itemcallnumber IS NOT NULL and items.itemcallnumber like 'D%'
+GROUP BY biblio.biblionumber
+having primjeraka < signatura
+order by items.itemcallnumber ;