[Koha] Problem with connection of itemcallnumber

Thank You but when i try to link the itemcallnumber with the field using command: update items.biblioitems set items.itemcallnumber=biblioitems.classificationwhere items.biblionumber=biblioitems.biblionumber; ERROR 1064:You have an error in your SQL syntax near 'biblioitems set items.itemcallnumber=biblioitems.classification where items.bibl' at line 1 -- Priyanka