10. Understanding ODBC Connectivity : ODBC Programming : National Character Set (Unicode) Columns
 
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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