Using linked subreports
When a subreport is linked, Crystal Reports coordinates the data in the subreport with the matching records in the primary report. If you need to use regular linked subreportsthat is, linked subreports that are not on-demand subreportsyou should consider these guidelines:
- If the additional data provided by a regular linked subreport is useful to relatively few users, create a linked on-demand subreport instead. Users who need to see the extra data click a hyperlink to view the subreport; users who don't need to see the extra data won't have to download it from the database server.
- In some cases, placing regular linked subreports in the Details section of a main report may hinder performanceespecially when your main report contains many records. (This is because you're creating a separate subreport for each record, and a separate query must be run for each database record in the main report.) As an alternative, consider using linked on-demand subreports in the Details section of your main report.