[MSDN Library June 1998] NOT NULL in CREATE TABLE Statements (18.8198812019567%)
MSDN Library Visual Studio 6.0 > Platform SDK > Database and Messaging Services > Microsoft Data Access SDK > Microsoft Open Database Connectivity (ODBC) > ODBC Programmer's Reference > Part 2 Developing Applications and Drivers > Chapter 16 Interoperability > Length of the Product Cycle > Writing an Interoperable Application > Features to Watch For