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Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Azure Synapse Analytics
Analytics Platform System (PDW)
SQL database in Microsoft Fabric
The OLE DB Driver for SQL Server 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.
Example
Code
DBID TableID;
DBID ColumnID;
HRESULT hr;
TableID.eKind = DBKIND_NAME;
TableID.uName.pwszName = L"MyTableName";
ColumnID.eKind = DBKIND_NAME;
ColumnID.uName.pwszName = L"MyColumnName";
hr = m_pITableDefinition->DropColumn(&TableID, &ColumnID);