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---
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title: 'Rollup'
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description: 'This article explains how to create & work with a Rollup field.'
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tags: ['Fields', 'Field types', 'Links based types', 'Rollup']
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keywords: ['Fields', 'Field types', 'Links based types', 'Rollup', 'Create rollup field']
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---
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`Rollup` fields are used to aggregate data from fields in the related table. Often used to calculate totals, averages, and other aggregate data.
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## Create a Rollup Field
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1. Click on `+` icon to the right of `Fields header`
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2. On the dropdown modal, enter the field name (Optional).
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3. Select the field type as `Lookup` from the dropdown.
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4. Select the link field from the dropdown. This is the field that links the current table to the related table.
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5. Select the field for display from the dropdown. This is the field that will be displayed in the current table.
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6. Select the aggregation function from the dropdown. This is the function that will be used to aggregate the data.
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7. Click on `Save Field` button.
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### Aggregation Functions
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Here's a table with brief descriptions for each of the aggregation functions supported by NocoDB:
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| Aggregation Function | Description |
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|----------------------|---------------------------------------------------------|
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| Count | Counts the number of records in a dataset. |
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| Minimum | Retrieves the minimum value from a dataset. |
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| Maximum | Retrieves the maximum value from a dataset. |
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| Average | Calculates the average value in a dataset. |
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| Sum | Adds up all the values in a dataset. |
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| Count Distinct | Counts the number of distinct values in a dataset. |
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| Sum Distinct | Adds up all the distinct values in a dataset. |
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| Average Distinct | Calculates the average of distinct values in a dataset. |
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## Similar links-based fields
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- [Links](010.links.md)
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- [Lookup](020.lookup.md)
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