nchar national char
nvarchar national varcharrowid
Each row in the database has an address. You can examine a row’ saddress by
querying the pseudocolumn ROWID. Values of this pseudocolumn are hexadecimal
strings representing the address of each row. These strings have the datatype
ROWID. You can also create tables and clusters that contain actual columns having
the ROWID datatype. Oracle does not guarantee that the values of such columns are
valid rowids.urowid
Each row in a database has an address. However, the rows of some tables have
addresses that are not physical or permanent, or were not generated by Oracle. For
example, the row addresses of index-organized tables are stored in index leaves,
which can move. Rowids of foreign tables (such as DB2 tables accessed through a
gateway) are not standard Oracle rowids.float
The FLOAT datatype is a floating-point number with a binary precision b. The default precision for this datatype is 126 binary, or 38 decimal.
nvarchar national varcharrowid
Each row in the database has an address. You can examine a row’ saddress by
querying the pseudocolumn ROWID. Values of this pseudocolumn are hexadecimal
strings representing the address of each row. These strings have the datatype
ROWID. You can also create tables and clusters that contain actual columns having
the ROWID datatype. Oracle does not guarantee that the values of such columns are
valid rowids.urowid
Each row in a database has an address. However, the rows of some tables have
addresses that are not physical or permanent, or were not generated by Oracle. For
example, the row addresses of index-organized tables are stored in index leaves,
which can move. Rowids of foreign tables (such as DB2 tables accessed through a
gateway) are not standard Oracle rowids.float
The FLOAT datatype is a floating-point number with a binary precision b. The default precision for this datatype is 126 binary, or 38 decimal.
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http://download-west.oracle.com/docs/cd/A87860_01/doc/server.817/a85397/sql_elem.htm#45443