UPPER(str)

返回字符串str，根据当前字符集映射的所有字符修改为大写。

SQL> SELECT UPPER('Allah-hus-samad');
+---------------------------------------------------------+
| UPPER('Allah-hus-samad')                                |
+---------------------------------------------------------+
| ALLAH-HUS-SAMAD                                         |
+---------------------------------------------------------+
1 row in set (0.00 sec)