# TO_UPPER

Returns a new string with all characters in the input string converted to upper case.

## Syntax

`TO_UPPER(str)`

### Parameters

#### str

String expression to be converted to upper case. If the value is `null`, the function returns `null`. The input can be a single-valued or multi-valued column or expression.

## Examples

Converts the contents of the `message` column to upper case and stores the result in a new column called `message_upper`:

```esql
ROW message = "Some Text"
| EVAL message_upper = TO_UPPER(message)
```