| Oracle® OLAP DML Reference 11g Release 2 (11.2) E17122-07 | 
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The ROWIDTONCHAR function converts a value of the ROWID data type to a value of the NCHAR data type. The result of this conversion is always in the national character set and is 18 characters long.
NCHAR
The result of this conversion is always in the national character set and is 18 characters long.
ROWIDTONCHAR (rowid)
The value of type ROWID to convert.
See Example 8-91, "Converting ROWID Data to TEXT or NTEXT Data".