Restituisce la stringa str dopo aver convertito tutte le lettere minuscole in maiuscole, basandosi sulla mappatura del set di caratteri in uso. Quello predefinito è latin1 (cp1252 West European).

MariaDB [test]> SELECT UPPER(surname), givenname FROM users ORDER BY surname;
| UPPER(surname) | givenname  |
| ABEL           | Jacinto    |
| CASTRO         | Robert     |
| COSTA          | Phestos    |
| MOSCHELLA      | Hippolytos |

UPPER() non fa nulla se viene usato su stringhe binarie (BINARY, VARBINARY o BLOB). La spiegazione di LOWER() mostra come convertire le stringhe binarie.


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