Merge: With a merge of two lists you can combine the data from both lists and Eloqua will account for any de-duplication.
Let’s say we’ve got two lists:
If we do a Merge of these two lists (by selecting both and then right-clicking), Eloqua will combine all of the contacts in the group, de-duplicating Alice’s contact record:
Intersect: An Intersect of two lists will reveal any overlapping contacts, so if we did an Intersect of the same two lists we would see a list only containing Alice, the one contact present in both original lists:
Trim: A trim will remove any overlapping contacts, so when trimming from Mike’s list, we’d see just Mike and his three boys:
While when trimming from Carol’s list, we’d see just Carol and her lovely girls: