# `sqrt`

## Description

Returns the square root of a number.

Note

This is the inverse of `power(number, 2)`.

## Syntax

Like many functions in DataPrime, `sqrt` supports [two notations](https://coralogix.com/docs/dataprime/language-reference/functions-reference/index.md), **function** and **method** notation. These interchangeable forms allow flexibility in how you structure expressions.

```dataprime
sqrt(number: number): number
```

```dataprime
(number: number).sqrt(): number
```

## Arguments

| Name   | Type   | Required | Description                             |
| ------ | ------ | -------- | --------------------------------------- |
| number | number | **true** | The value to compute the square root of |

## Example

**Use case: Compute rate of return over 2 years**

Calculate the rate of return for an asset purchase and sale by taking the square root of the price ratio and subtracting 1.

### Example data

```json
{
    "buyer": "Chris",
    "asset": "DataDog",
    "bought_at_price": 100,
    "sold_at_price": 10
}
```

### Example query

```dataprime
create ror from (sqrt(sold_at_price / bought_at_price) - 1)
```

```dataprime
create ror from ((sold_at_price / bought_at_price).sqrt() - 1)
```

### Example output

```json
{
    "buyer": "Chris",
    "asset": "DataDog",
    "bought_at_price": 100,
    "sold_at_price": 10,
    "ror": -0.683772233983162
}
```