Syntax:
UPPER(str)

Returns the string str with all characters changed to uppercase
according to the current character set mapping. The default is latin1
(cp1252 West European).

mysql> SELECT UPPER('Hej');
        -> 'HEJ'

UPPER() is ineffective when applied to binary strings (BINARY,
VARBINARY, BLOB). The description of LOWER() shows how to perform
lettercase conversion of binary strings.

URL: http://dev.mysql.com/doc/refman/5.1/en/string-functions.html

