Characters are stored in UTF-8 encoding. The maximum storage number of bytes required is four multiplied by max-length, although the actual storage required is usually much less.
NVARCHAR can also be specified as NCHAR VARYING, NATIONAL CHAR VARYING, or NATIONAL CHARACTER VARYING. Regardless of which
syntax is used, the data type is described as NVARCHAR.
When an embedded SQL client performs a DESCRIBE on a NVARCHAR column, the data type returned is either DT_VARCHAR or DT_NVARCHAR,
depending on whether the db_change_nchar_charset function has been called. See db_change_nchar_charset function.
Also, when an embedded SQL client performs a DESCRIBE on an NVARCHAR column, the length returned is the maximum byte length
in the client's NCHAR character set. For example, for an embedded SQL client using the Western European character set cp1252
as the NCHAR character set, an NVARCHAR(10) column is described as type DT_NVARCHAR of length 10 (10 characters multiplied
by a maximum of one byte per character). For an embedded SQL client using the Japanese character set cp932, the same column
is described as type DT_NVARCHAR of length 20 (10 characters multiplied by a maximum two bytes per character). If the describe
length would return more than 32767 bytes, the column is described as type DT_LONGNVARCHAR.