s

EXECUTE sp_addrolemember db_denydatareader, S21;
EXECUTE sp_addrolemember db_denydatawriter, S21;

EXECUTE sp_droprolemember db_denydatareader, S21;
EXECUTE sp_addrolemember db_denydatawriter, S21;

EXECUTE sp_addrolemember db_denydatareader, S21;
EXECUTE sp_droprolemember db_denydatawriter, S21;

EXECUTE sp_addrolemember db_denydatawriter, S21;
EXECUTE sp_addrolemember db_datawriter, S21;

EXECUTE sp_addrolemember db_denydatareader, S21;
EXECUTE sp_addrolemember db_datareader, S21;