source-data-query-openquery.md

title	description	author	ms.author	ms.reviewer	ms.date	ms.service	ms.subservice	ms.topic	ms.custom
OPENQUERY (DMX)	<source data query> - OPENQUERY	minewiskan	owend	owend	02/17/2022	sql	analysis-services	reference	dmx

<source data query> - OPENQUERY

[!INCLUDEssas]

Replaces the source data query with a query to an existing data source. The INSERT, SELECT FROM PREDICTION JOIN, and SELECT FROM NATURAL PREDICTION JOIN statements support OPENQUERY.

Syntax

  
OPENQUERY(<named datasource>, <query syntax>)  

Arguments

named datasource
A data source that exists on the [!INCLUDEmsCoName] [!INCLUDEssNoVersion] [!INCLUDEssASnoversion] database.

query syntax
A query syntax that returns a rowset.

Remarks

OPENQUERY provides a more secure way to access external data by supporting data source permissions. Because the connection string is stored in the data source, administrators can use the properties of the data source to manage access to the data. For more information about data sources, see Supported Data Sources (SSAS - Multidimensional).

You can get a list of the data sources that are available on a server by querying the MDSCHEMA_INPUT_DATASOURCES schema rowset. For more information about using MDSCHEMA_INPUT_DATASOURCES, see MDSCHEMA_INPUT_DATASOURCES Rowset.

You can also return a list of data sources in the current Analysis Services database by using the following DMX query:

SELECT * FROM $system.MDSCHEMA_INPUT_DATASOURCES

Examples

The following example uses the MyDS data source already defined in the [!INCLUDEssASnoversion] database to create a connection to the [!INCLUDE sssampledbdwobject-md] database and query the vTargetMail view.

OPENQUERY (MyDS,'SELECT TOP 1000 * FROM vTargetMail')  

See Also

<source data query>
Data Mining Extensions (DMX) Data Manipulation Statements
Data Mining Extensions (DMX) Statement Reference