# UPPER

Converts the string to uppercase letters.

## Syntax

```
UPPER(STRING)
```

## Arguments

#### STRING

Type: `string`

A sequence of characters.

## Returns

Type: `string`

`STRING` in uppercase letters.

***

## Examples

> SELECT UPPER("a") = "A" AND UPPER("abc") = "ABC" AND UPPER("123") = "123" AND UPPER("abc") = "ABC" AND UPPER('-=@#$') = "-=@#$" AND UPPER(null) is null AND UPPER(CAST(null as varchar)) is null

| STRING | Output |
| --- | --- |
| a | A |
| abc | ABC |
| 123 | 123 |
| abc | ABC |
| -=@#$ | -=@#$ |
| `null` | `null` |