# Aggregate

When you are building your dataset to create a dashboard, you might not have the values at the visualization level you need: if you have your data aggregated at a city level, you might want to visualize them at a country level. You will then need to aggregate them. YouPrep allows to aggregate your dataset. **You can apply the following operations to your dataset**:

* [Group By](https://docs-v3.toucantoco.com/data-management-in-datahub/datasets-in-toucan/preparing-data/overview-of-youprep-tm/aggregate/group-by)
* [Add totals rows](https://docs-v3.toucantoco.com/data-management-in-datahub/datasets-in-toucan/preparing-data/overview-of-youprep-tm/aggregate/add-total-rows)
* [Hierarchical roll-up](https://docs-v3.toucantoco.com/data-management-in-datahub/datasets-in-toucan/preparing-data/overview-of-youprep-tm/aggregate/hierarchical-rollup)
* [Get unique Groups/value](https://docs-v3.toucantoco.com/data-management-in-datahub/datasets-in-toucan/preparing-data/overview-of-youprep-tm/aggregate/get-unique-groups-values)