Anteckning
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Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Azure Synapse Analytics
Analytics Platform System (PDW)
The OLE DB Driver for SQL Server exposes the ITableDefinition::AddColumn function. This allows consumers to add a column to a SQL Server table.
When you add a column to a SQL Server table, the OLE DB Driver for SQL Server consumer is constrained as follows:
If DBPROP_COL_AUTOINCREMENT is VARIANT_TRUE, DBPROP_COL_NULLABLE must be VARIANT_FALSE.
If the column is defined by using the SQL Server timestamp data type, DBPROP_COL_NULLABLE must be VARIANT_FALSE.
For any other column definition, DBPROP_COL_NULLABLE must be VARIANT_TRUE.
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 new column name is specified as a Unicode character string in the pwszName member of the uName union in the dbcid member of the DBCOLUMNDESC parameter pColumnDesc. The eKind member must be DBKIND_NAME.