MDAC 2.5 SDK - ODBC Programmer's Reference
Chapter 17: Programming Considerations
When an ODBC 3.x application calls SQLExecDirect, SQLExecute, or SQLParamData in an ODBC 2.x driver to execute a searched update or delete statement that does not affect any rows at the data source, the driver should return SQL_SUCCESS, not SQL_NO_DATA. When an ODBC 2.x or ODBC 3.x application working with an ODBC 3.x driver calls SQLExecDirect, SQLExecute, or SQLParamData with the same result, the ODBC 3.x driver should return SQL_NO_DATA.