National Character Set (Unicode) Columns
The ODBC Driver supports SQL_C_WCHAR, SQL_WCHAR, SQL_WVARCHAR and SQL_WLONGVARCHAR data types for the following Ingres data types:
• nchar
• nvarchar
• long nvarchar
For databases that do not support Unicode, the ODBC treats Unicode characters as multi-byte (also known as double-byte) for:
• char
• varchar
• long varchar
• long byte