| title | SQLSpecialColumns | Microsoft Docs | |
|---|---|---|
| ms.custom | ||
| ms.date | 03/17/2017 | |
| ms.prod | sql | |
| ms.prod_service | database-engine, sql-database, sql-data-warehouse, pdw | |
| ms.reviewer | ||
| ms.technology | native-client | |
| ms.topic | reference | |
| apitype | DLLExport | |
| helpviewer_keywords |
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| ms.assetid | dffe02ed-8f79-4c9a-af34-98130bbe5462 | |
| author | markingmyname | |
| ms.author | maghan | |
| monikerRange | >=aps-pdw-2016||=azuresqldb-current||=azure-sqldw-latest||>=sql-server-2016||=sqlallproducts-allversions||>=sql-server-linux-2017||=azuresqldb-mi-current |
[!INCLUDEappliesto-ss-asdb-asdw-pdw-md]
When requesting row identifiers (IdentifierType SQL_BEST_ROWID), SQLSpecialColumns returns an empty result set (no data rows) for any requested scope other than SQL_SCOPE_CURROW. The generated result set indicates that the columns are only valid within this scope.
[!INCLUDEssNoVersion] does not support pseudocolumns for identifiers. The SQLSpecialColumns result set will identify all columns as SQL_PC_NOT_PSEUDO.
SQLSpecialColumns can be executed on a static cursor. An attempt to execute SQLSpecialColumns on an updatable (keyset-driven or dynamic) returns SQL_SUCCESS_WITH_INFO indicating the cursor type has been changed.
For information about the values returned for the columns DATA_TYPE, TYPE_NAME, COLUMN_SIZE, BUFFER_LENGTH, and DECIMAL_DIGTS for date/time types, see Catalog Metadata.
For more general information, see Date and Time Improvements (ODBC).
SQLSpecialColumns supports large CLR user-defined types (UDTs). For more information, see Large CLR User-Defined Types (ODBC).