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The SQL query above will return the list of dashboards that use at least one rich filter gadget. For each dashboard, the query returns the dashboard ID, dashboard name, dashboard owner, the ID, and the name these values:
Dashboard ID
Dashboard name
Dashboard owner
Rich filter ID
Name of the rich filter used in that dashboard.
The same rich filter can be used in multiple dashboards and each dashboard can use multiple rich filters, there is an n-to-n relationship between dashboards and rich filters.