> For the complete documentation index, see [llms.txt](https://docs.wem.io/platform/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.wem.io/platform/wemreference/operators/addition.md).

# Addition +

Operator: +

{% hint style="info" %}
The Addition operator **`+`** is used to add several values. 

The values can be of the following type:

* text
* number
* duration
* datetime
* concept
* concept\_set

This function is SQL compatible. For more information about SQL compatibility, see our [documentation](/platform/wemreference/sql-compatibility.md).
{% endhint %}

{% hint style="success" %}
Returns a new value that is the result of adding `value1` and `value2`. 

The type of the resulting value is dependent on the types of `value1` and `value2`:

* text + text returns a text
* number + number returns a number
* duration + duration returns a duration
* datetime + duration returns a datetime
* concept + concept returns a concept\_set
* concept + concept\_set returns a concept\_set
* concept\_set + concept\_set returns a concept\_set
  {% endhint %}

<details>

<summary><mark style="color:blue;"><code>value1</code></mark><code> + </code><mark style="color:blue;"><code>value2</code></mark></summary>

`"Hello" + ", " + "world"` \
*=> "Hello, world"*

`15 + 8 + 7`\
*=> 30*&#x20;

`'1d' + '6h' + '30m'`\
*=> 1 day, 6 hours and 30 minutes*

`Today() + '1d'`\
*=> tomorrow*

`'concept1' + 'concept2'`\
*=> { 'concept1', 'concept2' }*

</details>


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