docs-v2/content/flux/v0/stdlib/internal/promql/promhistogramquantile.md

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---
title: promql.promHistogramQuantile() function
description: >
`promql.promHistogramQuantile()` implements functionality equivalent to
[PromQL's `histogram_quantile()` function](https://prometheus.io/docs/prometheus/latest/querying/functions/#histogram_quantile).
menu:
flux_v0_ref:
name: promql.promHistogramQuantile
parent: internal/promql
identifier: internal/promql/promHistogramQuantile
weight: 201
---
<!------------------------------------------------------------------------------
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To make updates to this documentation, update the function comments above the
function definition in the Flux source code:
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------------------------------------------------------------------------------->
`promql.promHistogramQuantile()` implements functionality equivalent to
[PromQL's `histogram_quantile()` function](https://prometheus.io/docs/prometheus/latest/querying/functions/#histogram_quantile).
**Important**: The `internal/promql` package is not meant for external use.
##### Function type signature
```js
(
<-tables: stream[A],
?countColumn: string,
?quantile: float,
?upperBoundColumn: string,
?valueColumn: string,
) => stream[B] where A: Record, B: Record
```
{{% caption %}}
For more information, see [Function type signatures](/flux/v0/function-type-signatures/).
{{% /caption %}}
## Parameters
### tables
Input data. Default is piped-forward data (`<-`).
### quantile
Quantile to compute (`[0.0 - 1.0]`).
### countColumn
Count column name.
### upperBoundColumn
Upper bound column name.
### valueColumn
Output value column name.