# Add Field
On the main screen, the system allows to add a new field
2. Click on **Add Field**:
The system will display a screen to register the field data:
* **Field Name**: Inform the name that will be assigned to the field. A good practice is to include field information in the name.
* **Data Type**: Select the type of data that will be used in the field (String, Number and date)
* A brief description of the field types:
* String: Represented by alphanumeric characters (letters, numbers and special characters) that can be used in the field.
* Number: Represents quantitative information that can be measured and counted. Often used to perform mathematical operations and statistical analyses.
* Date: Represents information related to the date that can be used in the field.
* **Description**: Inform a brief description of the field that will be created.
* **Data Connectors**: When working with Data Connectors, only those selected below will be listed
* Inform the data connector that will be used. This is an optional field.
* **Define SQL**: Inform the SQL expression that will be used to form the calculated field.
* By clicking on the format button "", it is possible to indent the code, making it easier to read.
Note: When using a calculated field within another calculated field, you should use a colon before using double quotes. For example: SUM(:"pier/aws/fieldname":)
3. **Test Field**
By clicking on the "Test Field" button, it is possible to test the created field before saving it.
The system will display the screen to test the created field:
* It will be necessary to select the **Dataset** used and click on the "**Run test**" button:
The system will display the test result:
3. **Save Field**
By clicking on the **Save Field** button, the system will save the created field and return to the main screen.
