Introduction
Primary keys are essential for contact management. They guarantee the uniqueness of contacts for any additions or updates within a list.
Defining primary keys
One or more columns can be chosen as the primary key. Primary keys must be filled in for each contact during an import.
A contact is considered unique if the combination of its primary key values is itself unique.
Duplicated contact management
It's thanks to the combination of primary keys that duplicates in a list are identified. If several lines exist within the list with an identical combination, a single line will be randomly retained during import.
Contact update management
When importing contacts with the type "update", the detection of existing contacts in the list is carried out using primary keys.
Conclusion
Primary keys ensure the uniqueness and consistency of data in the list. They enable duplicates to be correctly removed and contacts to be updated.