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NCHAR & NVARCHAR
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”.