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> Exactly computes multiple quantiles at different levels simultaneously, returning the lower middle value for an even number of elements.

# quantilesExactLow

<h2 id="quantilesExactLow">
  quantilesExactLow
</h2>

Introduced in: v20.8.0

Exactly computes multiple [quantiles](https://en.wikipedia.org/wiki/Quantile) of a numeric data sequence at different levels simultaneously. For an even number of elements at level `0.5` it returns the lower of the two middle values.

This function is equivalent to [`quantileExactLow`](/reference/functions/aggregate-functions/quantileExactLow) but allows computing multiple quantile levels in a single pass, which is more efficient than calling individual quantile functions.

**Syntax**

```sql theme={null}
quantilesExactLow(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`, `DateTime` or `DateTime64`. [`(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) or [`DateTime64`](/reference/data-types/datetime64)

**Returned value**

Array of quantiles of the specified levels in the same order as the levels were specified. For numeric data types the output format matches the input format. [`Array((U)Int*)`](/reference/data-types/array) or [`Array(Float*)`](/reference/data-types/array) or [`Array(Decimal*)`](/reference/data-types/array) or [`Array(Date)`](/reference/data-types/array) or [`Array(DateTime)`](/reference/data-types/array) or [`Array(DateTime64)`](/reference/data-types/array)

**Examples**

**Computing multiple exact low quantiles**

```sql title=Query theme={null}
SELECT quantilesExactLow(0.25, 0.5, 0.75)(number) FROM numbers(10)
```

```response title=Response theme={null}
┌─quantilesExactLow(0.25, 0.5, 0.75)(number)─┐
│ [2,4,7]                                    │
└────────────────────────────────────────────┘
```