MDAC 2.5 SDK - ODBC Programmer's Reference
Chapter 16: Interoperability
The data types supported by DBMSs vary considerably. An application can determine the names and characteristics of supported data types by calling SQLGetTypeInfo. Because of wide variation in data type names, the application must use the data type names returned by SQLGetTypeInfo in CREATE TABLE statements. For more information, see "Data Types in ODBC" in Chapter 4, "ODBC Fundamentals."