Data Append

The Short Answer

A data append adds specific missing fields to an existing list or database by matching each record against a larger reference dataset. Common append types include email append, phone append, and demographic append. The output is the original list with new columns filled in, rather than a brand-new dataset.

How It Works

Each record in a list is matched against a data graph using whatever identifiers it already contains, then the specific missing fields requested, an email, a phone number, or a demographic attribute, are added as new columns.

Why It Matters

An append is targeted: you choose exactly which fields to fill in, rather than replacing or restructuring the list. That makes it a low-friction way to upgrade an existing database without starting over.

Learn how it works