> ## Documentation Index
> Fetch the complete documentation index at: https://private-7c7dfe99-mintlify-3a82795f.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

> quantiles, quantilesExactExclusive, quantilesExactInclusive, quantilesGK

# quantiles Functions

<h2 id="quantiles">
  quantiles
</h2>

Introduced in: v1.1.0

Computes multiple approximate [quantiles](https://en.wikipedia.org/wiki/Quantile) of a numeric data sequence at different levels simultaneously.

This function applies [reservoir sampling](https://en.wikipedia.org/wiki/Reservoir_sampling) with a reservoir size up to 8192 and a random number generator for sampling.
The result is non-deterministic.

Using `quantiles` is more efficient than calling multiple individual `quantile` functions when you need multiple quantile values, as all quantiles are calculated in a single pass through the data.

**Syntax**

```sql theme={null}
quantiles(level1, level2, ...)(expr)
```

**Parameters**

* `level` — Levels of quantiles. One or more constant floating-point numbers from 0 to 1. We recommend using `level` values in the range of `[0.01, 0.99]`. [`Float*`](/reference/data-types/float)

**Arguments**

* `expr` — Expression over the column values resulting in numeric data types, Date or DateTime. [`(U)Int*`](/reference/data-types/int-uint) or [`Float*`](/reference/data-types/float) or [`Decimal*`](/reference/data-types/decimal) or [`Date`](/reference/data-types/date) or [`DateTime`](/reference/data-types/datetime)

**Returned value**

Array of approximate quantiles of the specified levels in the same order as the levels were specified. [`Array(Float64)`](/reference/data-types/array) or [`Array(Date)`](/reference/data-types/array) or [`Array(DateTime)`](/reference/data-types/array)

**Examples**

**Computing multiple quantiles efficiently**

```sql title=Query theme={null}
CREATE TABLE t (val UInt32) ENGINE = Memory;
INSERT INTO t VALUES (1), (1), (2), (3), (4), (5), (6), (7), (8), (9), (10);

SELECT quantiles(0.25, 0.5, 0.75, 0.9)(val) FROM t;
```

```response title=Response theme={null}
┌─quantiles(0.25, 0.5, 0.75, 0.9)(val)─┐
│ [3, 5.5, 8, 9.5]                     │
└──────────────────────────────────────┘
```