Removing a Column from a SQL Server Table
SQLOLEDB exposes the ITableDefinition::DropColumn function, allowing consumers to remove a column from a Microsoft® SQL Server™ 2000 table.
Consumers specify the table name as a Unicode character string in the pwszName member of the uName union in the pTableID parameter. The eKind member of pTableID must be DBKIND_NAME.
The consumer indicates a column name in the pwszName member 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.
Note Removing a column is not supported for a consumer connected to a server running SQL Server version 6.5. ITableDefinition::DropColumn returns E_NOTIMPL when the consumer application attempts to remove a column.