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I want to create custom roll-up summary fields on the Campaign object from a custom object/field like Appointment__c.Price__c or Invoice__c.Amount__c.

But roll-up summary doesn't give me access to any object other than Campaign Members.

Do I need to write a Trigger or Batch Job do achieve this, or is there another way?

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    You can create Roll-Up Summary field only when you have Master-Detail relationship b/w objects. So here you can achieve this via Workflow or Trigger. – Pragati Jain Oct 13 '18 at 16:42
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Declarative Lookup Rollup Summaries is your friend any time you're seeking to roll up information that's any of

  • Not aggregated under a Master-Detail relationship
  • Requires filtering more complex than achievable with a native Roll-Up Summary field.
  • Uses aggregation operations like Concatenate.
  • Uses a standard object as the child.
  • Involves objects that don't support triggers (using Scheduled mode).

It's open source and well-tested in many, many orgs. You can achieve this objective without writing a line of Apex.

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