delete from /mdb/dba1 with version /** onerror(continue,`not exist`,`not find`,`not found`) **/ ; delete from /mdb/dba2 with version /** onerror(continue,`not exist`,`not find`,`not found`) **/ ; drop class if exists /mdb/dba1 ; drop class if exists /mdb/dba2 ; drop class if exists /mdb ; DROP DB IF EXISTS msqldb --FORCE ;