APPLIES TO: yesSQL Server yesAzure SQL Database yesAzure SQL Data Warehouse yesParallel Data Warehouse

A table might have a column or columns that can serve as unique row identifiers, and tables created without a PRIMARY KEY constraint return an empty result set to SQLPrimaryKeys. The ODBC function SQLSpecialColumns reports row identifier candidates for tables without primary keys.

SQLPrimaryKeys returns SQL_SUCCESS whether or not values exist for CatalogName, SchemaName, or TableName parameters. SQLFetch returns SQL_NO_DATA when invalid values are used in these parameters.

SQLPrimaryKeys can be executed on a static server cursor. An attempt to execute SQLPrimaryKeys on an updatable (dynamic or keyset) cursor will return SQL_SUCCESS_WITH_INFO indicating that the cursor type has been changed.

The SQL Server Native Client ODBC driver supports reporting information for tables on linked servers by accepting a two-part name for the CatalogName parameter: Linked_Server_Name.Catalog_Name.

SQLPrimaryKeys and Table-Valued Parameters

If the statement attribute SQL_SOPT_SS_NAME_SCOPE has the value SQL_SS_NAME_SCOPE_TABLE_TYPE, rather than its default value of SQL_SS_NAME_SCOPE_TABLE, SQLPrimaryKeys will return information about primary key columns of table types. For more information on SQL_SOPT_SS_NAME_SCOPE, see SQLSetStmtAttr.

For more information about table-valued parameters, see Table-Valued Parameters (ODBC).

See Also

SQLPrimaryKeys Function
ODBC API Implementation Details