# Single relations

**Single relations** help you fetch data from the **related collections**. 

To illustrate how it works, let's imagine we have the `Transactions` table that doesn't contain a **customer's email** and the `Users` table that contains the customer information including the email:

![](/files/-MkNPkf61ukzo95Sex7S)

And we want to **display the email** in the `Transactions` list:

![](/files/-MkNSOI-p4c83n5VXJT5)

First of all, we identify how our tables are **related**: for each user, there are several transactions that are related to the users list by the **ID** and **Customer ID fields:**

![](/files/-MkNN1Zfv7MgU1uT4A6a)

Now, let's create a new **custom column** in the `Transactions` table:

![](/files/-MkNTfKtz24SDPcnPcsU)

Then change the **column type** to `Link to record`

![](/files/-MkNUgvW4-UXL5u_HPQL)

Now, we need to select where we'll get the user email from (a related `Users` table), what field in the `Users` table is used to set relations with the `Transactions` table (the `ID` field), and what field from the `Users` table we'd like to display (the `Email` field):

![](/files/-MkNWT6xG9xGbSQ0OZDQ)

And the **final step** is to get our custom field value from the `Transactions` table field that sets relations to the `Users` table (the `Customer ID` field):

![](/files/-MkNXnKZh7yXZuEOwA7k)

Now, let's make UI components **dynamically visible** based on a rule:

{% content-ref url="/pages/-Mkg6VpZJSj1ZRY0u6Qf" %}
[Conditional Visibility](/getting-started/part-2-intermediate/conditional-visibility.md)
{% endcontent-ref %}


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