roll-up summary fields calculate values from a set of related records, such as those in a related list

While your formula fields calculate values using fields within a single record, roll-up summary fields calculate values from a set of related records, such as those in a related list. You can create roll-up summary fields that automatically display a value on a master record based on the values of records in a detail record. These detail records must be directly related to the master through a master-detail relationship. For example, a custom account field called Total Invoice Amount displays the sum of invoice amounts for all related invoice custom object records in the Invoices related list on an account.

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