---
title: AggMin
---

`AggMin` returns an aggregator that computes the minimum value, within an aggregation group, for each input column.

## Syntax

```
AggMin(pairs...)
```

## Parameters

<ParamTable>
<Param name="pairs" type="String...">

The source column(s) for the calculations.

- `"X"` will output the minimum value in the `X` column for each group.
- `"Y = X"` will output the minimum value in the `X` column for each group and rename it to `Y`.
- `"X, A = B"` will output the minimum value in the `X` column for each group and the minimum value in the `B` column while renaming it to `A`.

</Param>
</ParamTable>

> [!CAUTION]
> If an aggregation does not rename the resulting column, the aggregation column will appear in the output table, not the input column. If multiple aggregations on the same column do not rename the resulting columns, an error will result, because the aggregations are trying to create multiple columns with the same name. For example, in `table.aggBy([agg.AggSum(“X”), agg.AggAvg(“X”)])`, both the sum and the average aggregators produce column `X`, which results in an error.

## Returns

An aggregator that computes the minimum value, within an aggregation group, for each input column.

## Examples

In this example, `AggMin` returns the minimum `Y` value as grouped by `X`.

```groovy order=source,result
import static io.deephaven.api.agg.Aggregation.AggMin

source = newTable(
    stringCol("X", "A", "B", "A", "C", "B", "A", "B", "B", "C"),
    stringCol("Y", "M", "N", "O", "N", "P", "M", "O", "P", "M"),
    intCol("Number", 55, 76, 20, 130, 230, 50, 73, 137, 214),
)

result = source.aggBy([AggMin("Y")], "X")
```

In this example, `AggMin` returns the minimum `Y` value (renamed to `Z`), as grouped by `X`.

```groovy order=source,result
import static io.deephaven.api.agg.Aggregation.AggMin

source = newTable(
    stringCol("X", "A", "B", "A", "C", "B", "A", "B", "B", "C"),
    stringCol("Y", "M", "N", "O", "N", "P", "M", "O", "P", "M"),
    intCol("Number", 55, 76, 20, 130, 230, 50, 73, 137, 214),
)

result = source.aggBy([AggMin("Z = Y")], "X")
```

In this example, `AggMin` returns the minimum `Y` string and minimum `Number` integer as grouped by `X`.

```groovy order=source,result
import static io.deephaven.api.agg.Aggregation.AggMin

source = newTable(
    stringCol("X", "A", "B", "A", "C", "B", "A", "B", "B", "C"),
    stringCol("Y", "M", "N", "O", "N", "P", "M", "O", "P", "M"),
    intCol("Number", 55, 76, 20, 130, 230, 50, 73, 137, 214),
)

result = source.aggBy([AggMin("Y", "Number")], "X")
```

In this example, `AggMin` returns the minimum `Number`, as grouped by `X` and `Y`.

```groovy order=source,result
import static io.deephaven.api.agg.Aggregation.AggMin

source = newTable(
    stringCol("X", "A", "B", "A", "C", "B", "A", "B", "B", "C"),
    stringCol("Y", "M", "P", "O", "N", "P", "M", "O", "P", "N"),
    intCol("Number", 55, 76, 20, 130, 230, 50, 73, 137, 214),
)

result = source.aggBy([AggMin("Number")], "X", "Y")
```

In this example, `AggMin` returns the minimum `Number`, and `AggMax` returns the maximum `Number`, as grouped by `X`.

```groovy order=source,result
import static io.deephaven.api.agg.Aggregation.AggMin
import static io.deephaven.api.agg.Aggregation.AggMax

source = newTable(
    stringCol("X", "A", "B", "A", "C", "B", "A", "B", "B", "C"),
    stringCol("Y", "M", "P", "O", "N", "P", "M", "O", "P", "N"),
    intCol("Number", 55, 76, 20, 130, 230, 50, 73, 137, 214),
)

result = source.aggBy([AggMin("MinNumber = Number"),AggMax("MaxNumber = Number")], "X")
```

## Related documentation

- [Create a new table](../../../how-to-guides/new-and-empty-table.md#newtable)
- [How to create multiple summary statistics for groups](../../../how-to-guides/combined-aggregations.md)
- [`aggBy`](./aggBy.md)
- [`minBy`](./minBy.md)
- [Javadoc](https://deephaven.io/core/javadoc/io/deephaven/api/agg/Aggregation.html#AggMin(java.lang.String...))