## `TAU` [esql-tau]

**Syntax**

:::{image} ../../../../../images/tau.svg
:alt: Embedded
:class: text-center
:::

**Parameters**

**Description**

Returns the [ratio](https://tauday.com/tau-manifesto) of a circle’s circumference to its radius.

**Supported types**

| result |
| --- |
| double |

**Example**

```esql
ROW TAU()
```

| TAU():double |
| --- |
| 6.283185307179586 |