Dettaglio Lotto

Could not successfully run query (select a.*, b.descrizione as des_cat, DATE_FORMAT(, '%d/%m/%Y - %H:%i') as codsessione, d.tipo as tipoasta from lotti a, tipi_opera b, aste_sessioni c , aste d where a.categoria = b.codice and c.lotto_inizio <= and c.lotto_fine >= and c.asta = a.asta and d.asta = a.asta and from DB: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '' at line 1