How does an update-type import work? – Numberly

Introduction

When programming an active list or loading a new file for a static list, you are prompted to choose from two types of import for this file:

This choice defines how the import will impact the contact list.

type import.

This type of import is used to respond to a contact list feed using incremental files containing only the various movements since the last import.

The "update" type import performs the following processing:

Creation of a contact if the primary key grouping does not exist in the contact list;
Enrichment or modification of data if the contact present in the file already exists in the contact list;
No processing on contacts present in the contact list and absent from the file.

You can also opt for a "replace" type import, to do so consult the article How does a replace type import work?