---
title: Summary statistics
---

Hover the mouse over a column header to display a summary statistics popup. This information displayed by the popup varies depending on the column data type. Some column types - such as array columns created by [`group_by`](/core/docs/reference/table-operations/group-and-aggregate/groupBy) - do not have summary statistics.

## Generated Stats by Column Data Type

### Data Type: Boolean

- Count (number of non-null rows)
- Number of Rows
- Unique Values (number of distinct values)

### Data Type: Date/Timestamps

- Count
- Number of Rows
- Min
- Max

### Data Type: Number

- Count (number of non-null rows)
- Number of Rows
- Sum
- Sum (abs)
- Sume (sqrd)
- Min
- Max
- Min (abs)
- Max (abs)
- Avg
- Avg (abs)
- Std Dev

### Data Type: String

- Count
- Number of Rows
- Unique Values (number of distinct values)

## Related documentation

- [Code Studio](./code-studio.md)
- [Working with tables](./working-with-tables.md)