The **`UPPER()`** function converts a string sent as a parameter to uppercase. 

Figure 1 shows a visual representation of the `UPPER()` function.

# Syntax
```sql
UPPER(string)
```
# Parameter
The `UPPER()` function takes in a string that needs to be converted to uppercase as a required parameter.

# Return value
The `UPPER()` function returns the uppercase version of a string sent as a parameter.

> If a number is sent as a parameter, then `UPPER()` returns the number unchanged.

# Code





-- string
SELECT UPPER('hello');

-- number
SELECT UPPER(123);

What is UPPER() in SQL?

Converts a string to uppercase, returning the altered string. Numerical inputs remain unchanged.