Difference between report and sub-report [closed]

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What is a sub report and how is it different from a report? Thanks Furqan

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Subreport in Crystal Reports means a Report within a Report . When we want to show some additional information about the data in the Crystal Reports , we use the subreports to show the details. Subreports we show within the main Crystal Reports and also we can show it as On-Demand report , that means we put an Hyper link in the row, and when user click that hyper link then will get the subreport