I want to create a rollup summary field on contact object to count total number of times an activity has been logged. For example, log a call, log a meeting, and log an email. I want to know which object and field holds this information? I checked the activity object in salesforce but I did not find any relevant field.

  • Sounds more like tracking Tasks by subject than anything else. Custom Apex, like this answer – TSmith Mar 9 at 10:28

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