Retrieve data with queries

 

Applies To: Dynamics CRM 2015

There are several ways to create queries in Microsoft Dynamics CRM 2015 and Microsoft Dynamics CRM Online 2015 Update. You can use .NET Language-Integrated Query (LINQ) in early and late binding scenarios, you can write queries by using FetchXML, the proprietary Microsoft Dynamics CRM query language, or you can build a query by using QueryExpression and the QueryExpression class.

The following table lists the basic capabilities of each query style.

Query style	Capabilities
FetchXML	Supports all the features of QueryExpression plus aggregates and grouping. Queries are built as XML statements.
QueryExpression	Queries are built as an object model. Supports all the features in FetchXML except for aggregates and grouping.
LINQ	Queries are built using standard language, but internally uses QueryExpression so is limited to the features of QueryExpression.

Use FetchXML to create queries that return aggregates such as the sum of a value for all returned records. You can also perform “group by” operations with FetchXML.

.NET Language-Integrated Query (LINQ) uses standard query patterns. The OrganizationServiceContext class contains the LINQ query provider and is efficient at creating multiple associations.

The following messages are useful for working with queries when you want to convert between FetchXml and QueryExpression: FetchXmlToQueryExpressionRequest and QueryExpressionToFetchXmlRequest.

In this section

Build queries with LINQ (.NET language-integrated query)

Build queries with FetchXML

Build queries with QueryExpression

Query hierarchical data

Retrieve records for many-to-many relationships using intersect entities

FetchXML schema

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