# Customer Data

The Customer Table contains details of your Customers. This table has two mandatory fields: `customer_id` (string) and `customer_since` (date). You can also add additional data present in your Customer records, which can help improve accuracy of your Models.

{% hint style="warning" %}
The `customer_id` field is the primary key of this table. Each data record must have a Unique value for this field.
{% endhint %}

<table><thead><tr><th width="187">Field Name</th><th width="118">Data Type</th><th width="124">Example</th><th>Description</th></tr></thead><tbody><tr><td>*customer_id</td><td>String</td><td>e131498</td><td>This is the key field, used for Identification of Customers. All values in this field must be Unique.</td></tr><tr><td>*customer_since</td><td>Date</td><td>2010-12-21</td><td>Date of first contact with the Customer. This field is vital for future predictions, and every customer should have a value for this field.</td></tr><tr><td>customer_gender</td><td>String</td><td>female<br>Ms.<br>LLC</td><td>Gender or Title of the Customer; Used as Categories for Pattern Recognition.</td></tr><tr><td>customer_age</td><td>Date</td><td>1997-06-22</td><td>Date of birth of Customer / Date of foundation of Customer company. Missing values are acceptable.</td></tr><tr><td>zipcode</td><td>String</td><td>50676</td><td>ZipCode of the Customer.</td></tr><tr><td>customer_country</td><td>String</td><td><p>France</p><p>DE</p></td><td>Country where the Customer is based; Used as Categories for Pattern Recognition.</td></tr><tr><td>email_ending</td><td>String</td><td>gmail.com<br>live.com</td><td>Customer's email address provider. If email is mapped to this field, the part before @ is automatically removed; Used as Categories for Pattern Recognition</td></tr><tr><td>phone</td><td>String</td><td>0176<br>0153</td><td>The starting digits of the Customer's phone number; Used as Categories for Pattern Recognition</td></tr></tbody></table>