No distinct column values for sql: SELECT DISTINCT Concat(substr(nome_file_import, 1, 2), '-', TR, Personale) FROM totali_numero_periodo LEFT OUTER JOIN ass_simrisorse ON (totali_numero_periodo.Sim = ass_simrisorse.Sim) ORDER BY Concat(substr(nome_file_import, 1, 2), '-', TR, Personale)<br />