-- VMYSQL4.1 DELETE T1 FROM llx_boxes_def as T1, llx_boxes_def as T2 where T1.entity = T2.entity AND T1.file = T2.file AND T1.note = T2.note and T1.rowid > T2.rowid
-- VPGSQL8.2 DELETE FROM llx_boxes_def as T1 WHERE rowid NOT IN (SELECT min(rowid) FROM llx_boxes_def GROUP BY file, entity, note)