---
title: "CDP System Entities"
date: "2025-01-30T05:04:50+00:00"
summary: "Explore CDP system entities: Audience History and A1 Status tables with join relationships for effective data management."
image:
type: "page"
url: "/customer-data-platform/cdp-system-entities"
id: "92e609a6-6d22-4560-b713-92c6cea58413"
---

The following tables outline the join relationships among CDP system entities:

Audience History
----------------

The log lists all CDP campaigns or segments that include an audience and have been sent to destination channels.

**Entity Name**

**Key Join**

**Join**

AUDIENCEHISTORY

`mastercustomerid`

`audiencehistory.mastercustomerid=mastercustomer.mastercustomerid`

A1 Status
---------

An overview of the execution settings and job status for the most recent queries.

**Entity Name**

**Key Join**

**Join**

A1\_Status

`id`

Standalone