> ## Documentation Index
> Fetch the complete documentation index at: https://docs.getlago.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

> Aggregation types will define how consumption will be measured.

Here is the full list of **aggregation types** officially
supported by Lago.

| Aggregation      | Description                                                                        | Transcription                                                                                                                                                |
| ---------------- | ---------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| **COUNT**        | Count the number of times an incoming event occurs                                 | `COUNT(events.code)`                                                                                                                                         |
| **COUNT UNIQUE** | Count the number of unique values of a defined property for incoming events        | `COUNT_DISTINCT(events.properties.property_name)`                                                                                                            |
| **LATEST**       | Get the latest value of a defined property for incoming events                     | `LAST_VALUE(events.properties.property_name) OVER ([PARTITION BY events.timestamp])`                                                                         |
| **MAX**          | Get the maximum value of a defined property for incoming events                    | `MAX(events.properties.property_name)`                                                                                                                       |
| **SUM**          | Sum a defined property for incoming events                                         | `SUM(events.properties.property_name)`                                                                                                                       |
| **WEIGHTED SUM** | Sum a defined property for incoming events, prorated based on time used per period | `SUM(events.properties.property_name) / (DATEDIFF(SECOND, timestamp.event_1, timestamp.event_2) + 1) * (DATEDIFF(SECOND, 'period_start', 'period_end') + 1)` |
| **CUSTOM**       | Define a custom code for your aggregation                                          | Custom code                                                                                                                                                  |

<Note>Except the `COUNT` (that is counting the number of times an event occurs), the
other types aggregate over a single property of the event. **The result of this
aggregation will be used to charge your customers.**</Note>