Added new kb article connect-two-data-sources-single-table-telerik-re…

…porting (#1283)

* Added new kb article connect-two-data-sources-single-table-telerik-reporting

* Update connect-two-data-sources-single-table-telerik-reporting.md

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Co-authored-by: KB Bot <[email protected]>
Co-authored-by: Todor Arabadzhiev <[email protected]>

knowledge-base/connect-two-data-sources-single-table-telerik-reporting.md

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+---
+title: Connecting Two Data Sources within a Single Table
+description: "Learn how to connect two data sources within a single table in Telerik Reporting."
+type: how-to
+page_title: How to Connect Two WebAPI Data Sources within a Single Table in Telerik Reporting
+slug: connect-two-data-sources-single-table-telerik-reporting
+tags: telerik-reporting, data-sources, table
+res_type: kb
+ticketid: 1636749
+---
+
+## Environment
+
+| Property | Value                  |
+|----------|------------------------|
+| Product  | Progress Telerik Reporting |
+
+---
+
+## Description
+
+I need to use aggregate data from two data sources within a single table in Telerik Reporting. The goal is to find the difference between the total numbers from both sources.
+
+---
+
+## Solution
+
+To achieve this, you can use a [SubReport]({%slug telerikreporting/designing-reports/report-structure/subreport%}) as a workaround since there is no built-in mechanism for combining data across different data sources in Telerik Reporting. Follow these steps:
+
+1. Create a subreport definition that will contain the logic to calculate the difference between the two totals.
+1. Reference the subreport in a SubReport item that is placed in the Table Header/Footer of the main report table that uses the first data source. Let the SubReport item have the second source as a DataSource in the main report definition, or set the DataSource directly in the subreport definition.
+1. Pass the main report table total as a parameter to the SubReport ReportSource.
+1. In the subreport definition, use the passed parameter to calculate the difference with its total.
+
+Refer to the attached sample [main report](https://github.com/telerik/reporting-samples/blob/master/Sample%20Reports/AggregateFromTwoDS/MainReport.trdx) and its [subreport](https://github.com/telerik/reporting-samples/blob/master/Sample%20Reports/AggregateFromTwoDS/SubReport.trdx) for a demonstration of this solution.
+
+---
+
+## Notes
+
+Keep in mind that this workaround involves using a SubReport and passing parameters between the main report and the SubReport to perform the desired calculations.
+
+## Sample Reports
+
+* [MainReport.trdx](https://github.com/telerik/reporting-samples/blob/master/Sample%20Reports/AggregateFromTwoDS/MainReport.trdx)
+* [SubReport.trdx](https://github.com/telerik/reporting-samples/blob/master/Sample%20Reports/AggregateFromTwoDS/SubReport.trdx)