a. We want to KEEP the address on the LEFT , because it is a a FULL , complete address.
b. We want to KEEP the phone numbers on the right
in English, “merge” means to FILL-IN , which means to keep data in all fields, and COMBINE the data, but “merge in pipeline” means to choose LEFT side to keep or RIGHT side to keep - that is wrong.
We need to MERGE records, not make a choice between A or B