The UPPER-CASE function returns a character string that is the same length as argument-1 with each lower-case letter replaced by the corresponding upper-case letter. The type of this function depends on the argument as follows:
| Argument Type | Function Type |
|---|---|
| Alphabetic | Alphanumeric |
| Alphanumeric | Alphanumeric |
or national
and must be at least one character in length.