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NCHAR or NATIONALCHARACTER
NVARCHAR or NATIONAL CHAR VARYING or NATIONAL CHARACTER VARYING

NCHAR/VARCHAR are data types, which can be defined as the NCHAR/VARCHAR data types with a length of 1-32,767 bytes. The only difference to the NCHAR/VARCHAR data type is that NCHAR/VARCHAR automatically defines a special character set for this table column: "CHARACTER SET ISO8859_1".

See also:
CHAR and VARCHAR
Table Editor
SQL Editor
Data types and subtypes
Selecting the right data type to improve database performance
Firebird 2.5 Language Reference Update
Firebird 2.1 Language Reference Update
Firebird 2.0 Language Reference Update
SQL Language Reference

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