# Aggregate Functions in Studio

Studio provides several aggregation functions, allowing you to compute characteristics of entire columns. Aggregate expression functions can best be utilized in combination with the [Big Number chart](https://docs.foursquare.com/analytics-products/docs/charts-big-number), allowing you to display aggregated data to users.

| Function                     | Description                                             |  
| ---------------------------- | ----------------------------------------------------- |  
| sum(`real`)                 | Returns the sum of all values in a column.           |  
| count(`real`)               | Returns count of the values of the column.            |  
| mean(`real`)                | Returns mean value of the column.                     |  
| agg_min(`real`)             | Returns the min value of the column.                  |  
| agg_max(`real`)             | Returns the max value of the column.                  |  
| quantile(`real`, `k`)      | Returns the indexes of given k quantiles of the column.|

_A big number chart displaying the sum of a column._