# 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](/data-management-in-datahub/datasets-in-toucan/preparing-data/overview-of-youprep-tm/aggregate/group-by.md)
* [Add totals rows](/data-management-in-datahub/datasets-in-toucan/preparing-data/overview-of-youprep-tm/aggregate/add-total-rows.md)
* [Hierarchical roll-up](/data-management-in-datahub/datasets-in-toucan/preparing-data/overview-of-youprep-tm/aggregate/hierarchical-rollup.md)
* [Get unique Groups/value](/data-management-in-datahub/datasets-in-toucan/preparing-data/overview-of-youprep-tm/aggregate/get-unique-groups-values.md)


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