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@@ -5,17 +5,17 @@ author: Eugene Polevikov
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# Bind a Report to a Transformation-Based Data Source
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If you bind a report to a **JSON**, **Object**, **Entity Framework**, or **XPO** data source that contains a collection property, you can flatten the data source structure:
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If you bind a report to a [JSON](bind-a-report-to-json-data.md), [Object](bind-a-report-to-an-object-data-source.md), [Entity Framework](bind-a-report-to-an-entity-framework-data-source.md), or [XPO](bind-a-report-to-an-xpo-persistent-object.md) data source that contains a collection property, you can flatten the data source structure:
This tutorial illustrates how to use the **Federation Data Source**'s **Transformation** mode to flatten a JSON Data Source that contains a collection property.
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## Create a Report and Bind it to a Data Source
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1.**Create a new blank report**
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1.[Create a new blank report](../add-new-reports.md)
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2.**Add a JSON data source**
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2.[Add a JSON data source](bind-a-report-to-json-data.md)
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This tutorial uses the following JSON string:
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]
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```
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The **Field List** displays the created JSON data source.
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The [Field List](../report-designer-tools/ui-panels/field-list.md) displays the created JSON data source.
4. In the invoked **Query Builder**, select the **Transformation** query type. Select the data source or query that contains columns you want to transform. Select the **Transform** check box next to the column you need to unfold and flatten. The bottom pane allows you to specify the aliases for the generated columns.
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4. In the invoked [Query Builder](../report-designer-tools/query-builder.md), select the **Transformation** query type. Select the data source or query that contains columns you want to transform. Select the **Transform** check box next to the column you need to unfold and flatten. The bottom pane allows you to specify the aliases for the generated columns.
2. Drop data fields from the **Field List** onto the report's [Detail] band. Hold CTRL or SHIFT and click the fields to select multiple fields.
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2. Drop data fields from the **Field List** onto the report's [Detail](../introduction-to-banded-reports.md) band. Hold CTRL or SHIFT and click the fields to select multiple fields.
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