# STDDEVPOP

Returns the population standard deviation of values in a group as `Double`. This is the square root of the population variance.

## Signature

> STDDEVPOP(colName)

## Usage Examples

These examples are based on the [Batch Quick Start](https://docs.pinot.apache.org/start-here/quick-start#batch-processing).

```sql
select STDDEVPOP(hits) AS value
from baseballStats
WHERE hits > 0
```

| value    |
| -------- |
| 35.13642 |