Removing a Column from a SQL Server Table
The SQL Native Client OLE DB provider exposes the ITableDefinition::DropColumn function. This allows consumers to remove a column from a SQL Server table.
Consumers specify the table name as a Unicode character string in the pwszNamemember of the uName union in the pTableID parameter. The eKindmember of pTableID must be DBKIND_NAME.
The consumer indicates a column name in the pwszNamemember of the uName union in the pColumnID parameter. The column name is a Unicode character string. The eKind member of pColumnID must be DBKIND_NAME.