# Greatest

> Supported in: Batch, Faster, Streaming

Computes the greatest value amongst all input columns, skipping null values.

**Expression categories:** Numeric

## Declared arguments

* **Expressions:** List of columns from which to compute greatest value.<br>*List\<Expression\<T>>*

**Type variable bounds:** *T accepts ComparableType*

**Output type:** *T*

## Examples

### Example 1: Base case

**Argument values:**

* **Expressions:** \[`a`, `b`, `c`]

| a | b | c | **Output** |
| ----- | ----- | ----- | ----- |
| 1 | 2 | 3 | 3 |
| 1 | 3 | 2 | 3 |
| 3 | 2 | 1 | 3 |

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### Example 2: Null case

**Description:** Returns null if values of all inputs are null.

**Argument values:**

* **Expressions:** \[`a`, `b`]

| a | b | **Output** |
| ----- | ----- | ----- |
| *null* | *null* | *null* |

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### Example 3: Null case

**Description:** Any null values are ignored for comparison purposes.

**Argument values:**

* **Expressions:** \[`a`, `b`]

| a | b | **Output** |
| ----- | ----- | ----- |
| *null* | -2147483648 | -2147483648 |
| *null* | 0 | 0 |
| *null* | 2147483647 | 2147483647 |

***