0 NVARCHAR2 VARCHAR2 FLOAT NUMBER LONG DATE RAW LONG_RAW XMLTYPE . ROWID NCHAR CHAR BINARY_FLOAT BINARY_DOUBLE MLSLABEL REF NCLOB CLOB BLOB BFILE TIME TIME_WITH_TIMEZONE TIMESTAMP TIMESTAMP_WITH_TIMEZONE INTERVAL_YEAR_TO_MONTH INTERVAL_DAY_TO_SECOND UROWID TIMESTAMP_WITH_LOCAL_TIMEZONE NOT_NULL Y N Y N