# Expressions

> Expressions allow you to add business logic to your data.

## Introduction

Expressions allow you to add business logic to your data.

## Creating a new expression

Follow these steps to create a new expression.

| Step | Action |
| --- | --- |
| 1 | Go to the **Data** tab in your app development environment. |
| 2 | In the table list, click on the table in which you want to create an expression.  The table items are displayed in the table item list. |
| 3 | Right click in the table item list and select **New expression...**. |

The **Edit Expression Attribute** dialog is displayed. See illustration below.

![docs image](https://dev-assets.cms.uipath.com/assets/images/process-mining/process-mining-docs-image-56017-242402e5-dece18a2.webp)

Below is a description of the elements of the **Edit Expression Attribute** dialog.

| Element | Description |
| --- | --- |
| General properties | Contains basic information about the expression:  • **Name**  •**ID**  • The **Table** in which the new expression attribute will be placed |
| Type | Enables you to select the expression type:  • Per record  • Aggregate  • Lookup  • Switch |
| Expression editor | Enables you to define what the expression will compute. |
| Results panel | Displays the list of unique values of the expression and the frequency. |
| Help button | Opens the **Expression help** dialog. |
| ADVANCED... | Opens the **Advanced Settings** dialog. |

:::note
Within the general information by default the **Name** is linked to the **ID**. This can be turned on and off by pressing the link sign. When turned off it is possible to change the name without changing the ID, or vice versa.
:::