# UPPER
<a name="sql-reference-upper"></a>

```
< UPPER ( <character-expression> )
```

Converts a string to all upper-case characters. Returns null if the input argument is null, and the empty string if the input argument is an empty string.

## Examples
<a name="sqlrf-upper-examples"></a>


| Function | Result | 
| --- | --- | 
|  UPPER('abcDEFghi123')  |  ABCDEFGHI123  |